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MPC8378CZQAFDA 数据表(PDF) 49 Page - Freescale Semiconductor, Inc |
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MPC8378CZQAFDA 数据表(HTML) 49 Page - Freescale Semiconductor, Inc |
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49 / 126 page  MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2 Freescale Semiconductor 49 Enhanced Secure Digital Host Controller (eSDHC) Due to the special implementation of the eSDHC, there are constraints regarding the clock and data signals propagation delay on the user board. The constraints are for minimum and maximum delays, as well as skew between the CLK and DAT/CMD signals. In full speed mode, there is no need to add special delay on the data or clock signals. The user should make sure to meet the timing requirements as described further within this document. If the system is designed to support both high-speed and full-speed cards, the high-speed constraints should be fulfilled. If the systems is designed to operate up to 25 MHz only, full-speed mode is recommended. 11.1 eSDHC DC Electrical Characteristics Table 45 provides the DC electrical characteristics for the eSDHC (SD/MMC) interface of the device. 11.2 eSDHC AC Timing Specifications (Full-Speed Mode) This section describes the AC electrical specifications for the eSDHC (SD/MMC) interface of the device. Table 46 provides the eSDHC AC timing specifications for full-speed mode as defined in Figure 31 and Figure 32. Table 45. eSDHC interface DC Electrical Characteristics Parameter Symbol Condition Min Max Unit Input high voltage VIH — 0.625 × OVDD OVDD +0.3 V Input low voltage VIL — –0.3 0.25 × OVDD V Input current IIN —— ±30 μA Output high voltage VOH IOH = –100 uA, at OVDD(min) 0.75 × OVDD —V Output low voltage VOL IOL = +100 uA, at OVDD(min) — 0.125 × OVDD V Table 46. eSDHC AC Timing Specifications for Full-Speed Mode At recommended operating conditions OVDD = 3.3 V ± 165 mV. Parameter Symbol 1 Min Max Unit Notes SD_CLK clock frequency—full speed mode fSFSCK 025 MHz — SD_CLK clock cycle tSFSCK 40 — ns — SD_CLK clock frequency—identification mode fSIDCK 0400 KHz — SD_CLK clock low time tSFSCKL 15 — ns 2 SD_CLK clock high time tSFSCKH 15 — ns 2 SD_CLK clock rise and fall times tSFSCKR/ tSFSCKF —5 ns 2 Input setup times: SD_CMD, SD_DATx, SD_CD to SD_CLK tSFSIVKH 5— ns 2 |
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