SNAS855C November 2023 – May 2024 LMKDB1108 , LMKDB1120 , LMKDB1204
PRODUCTION DATA
Table 9-29 lists the memory-mapped registers for the LMKDB1108 registers. All register offset addresses not listed in Table 9-29 must be considered as reserved locations and the register contents must not be modified.
Offset | Acronym | Register Name | Section |
---|---|---|---|
0h | R0 | Output Enable Control for CLK2 through CLK7 | Section 9.2.1 |
1h | R1 | Output Enable Control for CLK0 and CLK1 | Section 9.2.2 |
2h | R2 | OE Pin Readback for CLK2 through CLK7 | Section 9.2.3 |
3h | R3 | OE Pin Readback for CLK0 and CLK1 | Section 9.2.4 |
4h | R4 | AOD Enable Control and SBI_EN Readback | Section 9.2.5 |
5h | R5 | Device Info | Section 9.2.6 |
6h | R6 | Device Info (cont.) | Section 9.2.7 |
7h | R7 | SMBus Byte Counter | Section 9.2.8 |
8h | R8 | SBI Mask for CLK2 through CLK7 | Section 9.2.9 |
9h | R9 | SBI Mask for CLK0 and CLK1 | Section 9.2.10 |
Bh | R11 | SBI Mask Readback for CLK0 through CLK5 | Section 9.2.11 |
Ch | R12 | SBI Mask Readback for CLK6 and CLK7 | Section 9.2.12 |
11h | R17 | Output Amplitude | Section 9.2.13 |
12h | R18 | Input Configuration, Save Config in PD, SMB SDATA Monitoring, and LOS Readback | Section 9.2.14 |
14h | R20 | Output Slew Rate Select MSB for CLK2 through CLK7 | Section 9.2.15 |
15h | R21 | Output Slew Rate Select MSB for CLK0 and CLK1 | Section 9.2.16 |
26h | R38 | Non-clearable SMBUS Write Lock | Section 9.2.17 |
27h | R39 | LOS Event Status and Clearable SMBus Write Lock | Section 9.2.18 |
35h | R53 | Slew Rate Mode Control Selection | Section 9.2.19 |
62h | R98 | Output Slew Rate Select LSB for CLK0 through CLK7 | Section 9.2.20 |
Complex bit access types are encoded to fit into small table cells. Table 9-30 shows the codes that are used for access types in this section.
Access Type | Code | Description |
---|---|---|
Read Type | ||
R | R | Read |
RC | R C |
Read to Clear |
Write Type | ||
W | W | Write |
W1C | W 1C |
Write 1 to clear |
WSC | W | Write |
Reset or Default Value | ||
-n | Value after reset or the default value |
R0 is shown in Table 9-31.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | CLK_EN_2 | R/W | 1h | Output Enable for CLK2 0h = Output Disabled (low/low) 1h = Output Enabled |
6 | CLK_EN_3 | R/W | 1h | Output Enable for CLK3 0h = Output Disabled (low/low) 1h = Output Enabled |
5 | CLK_EN_4 | R/W | 1h | Output Enable for CLK4 0h = Output Disabled (low/low) 1h = Output Enabled |
4 | RESERVED | R | 0h | Reserved |
3 | CLK_EN_5 | R/W | 1h | Output Enable for CLK5 0h = Output Disabled (low/low) 1h = Output Enabled |
2 | CLK_EN_6 | R/W | 1h | Output Enable for CLK6 0h = Output Disabled (low/low) 1h = Output Enabled |
1 | CLK_EN_7 | R/W | 1h | Output Enable for CLK7 0h = Output Disabled (low/low) 1h = Output Enabled |
0 | RESERVED | R | 0h | Reserved |
R1 is shown in Table 9-32.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:6 | RESERVED | R | 0h | Reserved |
5 | CLK_EN_0 | R/W | 1h | Output Enable for CLK0 0h = Output Disabled (low/low) 1h = Output Enabled |
4:3 | RESERVED | R | 0h | Reserved |
2 | CLK_EN_1 | R/W | 1h | Output Enable for CLK1 0h = Output Disabled (low/low) 1h = Output Enabled |
1:0 | RESERVED | R | 0h | Reserved |
R2 is shown in Table 9-33.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | RB_OEb_2 | R | 0h | Status of OEb2 |
6 | RB_OEb_3 | R | 0h | Status of OEb3 |
5 | RB_OEb_4 | R | 0h | Status of OEb4 |
4 | RESERVED | R | 0h | Reserved |
3 | RB_OEb_5 | R | 0h | Status of OEb5 |
2 | RB_OEb_6 | R | 0h | Status of OEb6 |
1 | RB_OEb_7 | R | 0h | Status of OEb7 |
0 | RESERVED | R | 0h | Reserved |
R3 is shown in Table 9-34.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:6 | RESERVED | R | 0h | Reserved |
5 | RB_OEb_0 | R | 0h | Status of OEb0 |
4:3 | RESERVED | R | 0h | Reserved |
2 | RB_OEb_1 | R | 0h | Status of OEb1 |
1:0 | RESERVED | R | 0h | Reserved |
R4 is shown in Table 9-35.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:5 | RESERVED | R | 0h | Reserved |
4 | AOD_ENABLE | R/W | 1h | Enable automatic output disable (AOD)
to low/low when LOS event is detected. Refer to
section "Automatic Output Disable" for more
information. 0h = Disabled (DC Coupled) 1h = Enabled (AC Coupled) |
3:1 | RESERVED | R | 0h | Reserved |
0 | RB_SBI_ENQ | R | 0h | Status of SBI_ENQ |
R5 is shown in Table 9-36.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:4 | RESERVED | R | 0h | Reserved |
3:0 | VENDOR_ID | R | Ah | Vendor ID |
R6 is shown in Table 9-37.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:0 | DEV_ID | R | 8h | Device ID |
R7 is shown in Table 9-38.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:5 | RESERVED | R | 0h | Reserved |
4:0 | SMBUS_BC | R/W | 7h | SMBUS Block Read Byte Count |
R8 is shown in Table 9-39.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | SBI_MASK_2 | R/W | 0h | Mask off Side-Band Disable for CLK2 |
6 | SBI_MASK_3 | R/W | 0h | Mask off Side-Band Disable for CLK3 |
5 | SBI_MASK_4 | R/W | 0h | Mask off Side-Band Disable for CLK4 |
4 | RESERVED | R | 0h | Reserved |
3 | SBI_MASK_5 | R/W | 0h | Mask off Side-Band Disable for CLK5 |
2 | SBI_MASK_6 | R/W | 0h | Mask off Side-Band Disable for CLK6 |
1 | SBI_MASK_7 | R/W | 0h | Mask off Side-Band Disable for CLK7 |
0 | RESERVED | R | 0h | Reserved |
R9 is shown in Table 9-40.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:6 | RESERVED | R | 0h | Reserved |
5 | SBI_MASK_0 | R/W | 0h | Mask off Side-Band Disable for CLK0 |
4:3 | RESERVED | R | 0h | Reserved |
2 | SBI_MASK_1 | R/W | 0h | Mask off Side-Band Disable for CLK1 |
1:0 | RESERVED | R | 0h | Reserved |
R11 is shown in Table 9-41.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | SBI_CLK_2 | R | 1h | Readback of Side-Band Disable for CLK5 |
6 | SBI_CLK_3 | R | 1h | Readback of Side-Band Disable for CLK4 |
5 | SBI_CLK_4 | R | 1h | Readback of Side-Band Disable for CLK3 |
4 | RESERVED | R | 0h | Reserved |
3 | SBI_CLK_5 | R | 1h | Readback of Side-Band Disable for CLK2 |
2 | SBI_CLK_6 | R | 1h | Readback of Side-Band Disable for CLK1 |
1 | SBI_CLK_7 | R | 1h | Readback of Side-Band Disable for CLK0 |
0 | RESERVED | R | 0h | Reserved |
R12 is shown in Table 9-42.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:6 | RESERVED | R | 0h | Reserved |
5 | SBI_CLK_0 | R | 1h | Readback of Side-Band Disable for CLK7 |
4:3 | RESERVED | R | 0h | Reserved |
2 | SBI_CLK_1 | R | 1h | Readback of Side-Band Disable for CLK6 |
1:0 | RESERVED | R | 0h | Reserved |
R17 is shown in Table 9-43.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:4 | AMP_1 | R/W | 6h | Global Differential output Control,
approximately 0.6 V to 1 V 25 mV/step Default = 0.8V
0h = 600 mV 1h = 625 mV 2h = 650 mV 3h = 675 mV 4h = 700 mV 5h = 725 mV 6h = 750 mV 7h = 775 mV 8h = 800 mV 9h = 825 mV Ah = 850 mV Bh = 875 mV Ch = 900 mV Dh = 925 mV Eh = 950 mV Fh = 975 mV |
3:0 | RESERVED | R | 0h | Reserved |
R18 is shown in Table 9-44.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | RX_EN_AC_INPUT | R/W | 0h | Enable receiver bias when CLKIN is AC
coupled 0h = DC Coupled Input 1h = AC Coupled Input |
6 | RX_EN_RTERM_LSB | R/W | 0h | Enable/Disables termination resistors
on CLKIN1 0h = Disabled 1h = Enabled |
5 | RESERVED | R | 0h | Reserved |
4 | RESERVED | R | 0h | Reserved |
3 | PD_RESTOREB | R/W | 1h | Save Configuration in Power Down 0h = Config Cleared 1h = Config Saved |
2:1 | RESERVED | R | 0h | Reserved |
0 | LOSb_RB | R | 0h | Real time read back of loss detect
block output 0h = LOS Event Detected 1h = LOS Event Not-Detected |
R20 is shown in Table 9-45.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | SLEWRATE_SEL_CLK2_MSB | R/W | 1h | MSB CLK2 slew rate select |
6 | SLEWRATE_SEL_CLK3_MSB | R/W | 1h | MSB CLK3 slew rate select |
5 | SLEWRATE_SEL_CLK4_MSB | R/W | 1h | MSB CLK4 slew rate select |
4 | RESERVED | R | 0h | Reserved |
3 | SLEWRATE_SEL_CLK5_MSB | R/W | 1h | MSB CLK5 slew rate select |
2 | SLEWRATE_SEL_CLK6_MSB | R/W | 1h | MSB CLK6 slew rate select |
1 | SLEWRATE_SEL_CLK7_MSB | R/W | 1h | MSB CLK7 slew rate select |
0 | RESERVED | R | 0h | Reserved |
R21 is shown in Table 9-46.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:6 | RESERVED | R | 0h | Reserved |
5 | SLEWRATE_SEL_CLK0_MSB | R/W | 1h | MSB CLK0 slew rate select |
4:3 | RESERVED | R | 0h | Reserved |
2 | SLEWRATE_SEL_CLK1_MSB | R/W | 1h | MSB CLK1 slew rate select |
1:0 | RESERVED | R | 0h | Reserved |
R38 is shown in Table 9-47.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:1 | RESERVED | R | 0h | Reserved |
0 | WRITE_LOCK | R | 0h | Non-clearable SMBus Write Lock bit.
When written to one, the SMBus control registers
cannot be written to. This bit can only be cleared
by recycling power. 0h = SMBus Not Locked for Writing 1h = SMBus Locked for Writing |
R39 is shown in Table 9-48.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:2 | RESERVED | R | 0h | Reserved |
1 | LOS_EVT | R/W | 0h | LOS Event Status. When high, indicates
that a LOS event is detected. Can be cleared by
writing a 1 to the bit. 0h = Not LOS Event Detected 1h = LOS Event Detected |
0 | WRITE_LOCK_RW1C | R | 0h | Clearable SMBus Write Lock bit. When
written to one, the SMBus control registers cannot
be written to. This bit can be cleared by writing a
1 to the bit. 0h = SMBus Not Locked for Writing 1h = SMBus Locked for Writing |
R53 is shown in Table 9-49.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7:6 | RESERVED | R | 0h | Reserved |
5 | SLEWRATE_CTRL_MODE | R/WSC | 0h | Sets which mode is used to change the
outputs slew rates 0h = Pin mode 1h = SMBus mode |
4:0 | RESERVED | R | 0h | Reserved |
R98 is shown in Table 9-50.
Return to the Summary Table.
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7 | SLEWRATE_SEL_CLK7_LSB | R/W | 0h | LSB CLK7 Slew Rate Control |
6 | SLEWRATE_SEL_CLK6_LSB | R/W | 0h | LSB CLK6 Slew Rate Control |
5 | SLEWRATE_SEL_CLK5_LSB | R/W | 0h | LSB CLK5 Slew Rate Control |
4 | SLEWRATE_SEL_CLK4_LSB | R/W | 0h | LSB CLK4 Slew Rate Control |
3 | SLEWRATE_SEL_CLK3_LSB | R/W | 0h | LSB CLK3 Slew Rate Control |
2 | SLEWRATE_SEL_CLK2_LSB | R/W | 0h | LSB CLK2 Slew Rate Control |
1 | SLEWRATE_SEL_CLK1_LSB | R/W | 0h | LSB CLK1 Slew Rate Control |
0 | SLEWRATE_SEL_CLK0_LSB | R/W | 0h | LSB CLK0 Slew Rate Control |