Table 6-66, Figure 6-84, Table 6-67, and Figure 6-85 present switching characteristics for MMC0 – HS400 Mode.
Table 6-66 MMC0 Timing Requirements – HS400 Mode see Figure 6-84
NO. |
|
MIN |
MAX |
UNIT |
HS4000 |
tDSMPW |
Pulse width, MMC0_DS |
1.95 |
|
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 6-67 MMC0 Switching Characteristics – HS400 Mode see Figure 6-85NO. | PARAMETER | DESCRIPTION | MIN | MAX | UNIT |
---|
| fop(clk) | Operating frequency, MMC0_CLK | | 200 | MHz |
HS4005 | tc(clk) | Cycle time, MMC0_CLK | 5 | | ns |
HS4006 | tw(clkH) | Pulse duration, MMC0_CLK high | 2.23 | | ns |
HS4007 | tw(clkL) | Pulse duration, MMC0_CLK low | 2.23 | | ns |
HS4008 | tosu(cmdV-clkH) | Output setup time, MMC0_CMD valid to MMC0_CLK rising edge(1) | 2.54 | | ns |
HS4009 | tosu(dV-clk) | Output setup time, MMC0_DAT[7:0] valid to MMC0_CLK rising or falling edge(1) | 0.63 | | ns |
HS4010 |
toh(clkH-cmdIV) |
Output hold time, MMC0_CLK rising edge to MMC0_CMD invalid(2) |
0.98 |
|
ns |
HS4011 |
toh(clk-dIV) |
Output hold time, MMC0_CLK rising or falling edge to MMC0_DAT[7:0] invalid(2) |
0.72 |
|
ns |
(1) This parameter defines the output setup time provided to the attached device. This time is relative to the next capture clock edge. 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. 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.