Table 6-90, Figure 6-75, Table 6-91, and Figure 6-76 present timing requirements and switching characteristics for MMC0 – HS400
Mode.
Table 6-90 MMC0 Timing Requirements – HS400 Mode see Figure 6-75
NO. |
|
MIN |
MAX |
UNIT |
HS4000 |
tDSMPW |
Pulse width, MMC0_DS |
2.0 |
|
ns |
HS4001 |
tRQ_DAT |
Input skew, MMC0_DS to MMC0_DAT valid |
|
475 |
ps |
HS4002 |
tRQH_DAT |
Input skew hold, MMC0_DAT invalid to
MMC0_DS |
|
475 |
ps |
HS4003 |
tRQ_CMD |
Input skew, MMC0_DS to MMC0_CMD
valid |
|
475 |
ps |
HS4004 |
tRQH_CMD |
Input skew hold, MMC0_CMD invalid to
MMC0_DS |
|
475 |
ps |
Table 6-91 MMC0 Switching Characteristics
– HS400 Mode see Figure 6-76
NO. |
PARAMETER |
DESCRIPTION |
MIN |
MAX |
UNIT |
|
fop(clk) |
Operating frequency, MMC0_CLK |
|
200 |
MHz |
HS4005 |
tc(clkH) |
Cycle time, MMC0_CLK |
5 |
|
ns |
HS4006 |
tw(clkH) |
Pulse duration, MMC0_CLK high |
2.24 |
|
ns |
HS4007 |
tw(clkL) |
Pulse duration, MMC0_CLK low |
2.24 |
|
ns |
HS4008 |
tosu(cmdV-clkH) |
Output setup time, MMC0_CMD valid to
MMC0_CLK rising edge(1) |
2.58 |
|
ns |
HS4009 |
tosu(dV-clk) |
Output setup time, MMC0_DAT[7:0] valid to
MMC0_CLK rising or falling edge(1) |
0.60 |
|
ns |
HS40010 |
toh(clkH-cmdIV) |
Output hold time, MMC0_CLK rising edge to
MMC0_CMD invalid(2) |
1.12 |
|
ns |
HS40011 |
toh(clk-dIV) |
Output hold time, MMC0_CLK rising or
falling edge to MMC0_DAT[7:0] invalid(2) |
0.85 |
|
ns |
(1) This parameter defines the output
setup time provided to the attached device. This time is relative to the next
capture clock edge and already includes the maximum propagation delay mismatch
value defined in the MMC0 Timing Conditions table. The timing references
for this parameter are from mid-supply of the DAT or CMD signal transition to
mid-supply of the CLK signal transition. The eMMC standard defines the setup
timing references from VIL or VIH of the DAT or CMD signal transition to
mid-supply of the CLK signal transition. Therefore, the system designer must
consider the impact of the DAT signal slew rate when designing the PCB, and
ensure the time it takes for the DAT signal to slew from mid-supply to VIL or
VIH does not erode the setup time margin.
(2) This parameter defines the output
hold time provided to the attached device. This time is relative to the previous
launch clock edge and already includes the maximum propagation delay mismatch
value defined in the MMC0 Timing Conditions table. The timing references
for this parameter are from mid-supply of the CLK signal transition to
mid-supply of the DAT or CMD signal transition. The eMMC standard defines the
hold timing references from mid-supply of the CLK signal transition to VIL or
VIH of the DAT or CMD signal transition. Therefore, the system designer must
consider the impact of the DAT signal slew rate when designing the PCB, and
ensure the time it takes for the DAT signal to slew from VIL or VIH to
mid-supply does not erode the hold time margin.