参数资料
型号: MCIMX255AVM4
厂商: Freescale Semiconductor
文件页数: 123/140页
文件大小: 0K
描述: IC MPU I.MX25 AUTO 400MAPBGA
标准包装: 90
系列: i.MX25
核心处理器: ARM9
芯体尺寸: 32-位
速度: 400MHz
连通性: 1 线,CAN,EBI/EMI,以太网,I²C,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外围设备: DMA,I²S,LCD,POR,PWM,WDT
输入/输出数: 128
程序存储器类型: 外部程序存储器
RAM 容量: 144K x 8
电压 - 电源 (Vcc/Vdd): 1.15 V ~ 1.52 V
数据转换器: A/D 3x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 400-LFBGA
包装: 托盘
i.MX25 Applications Processor for Automotive Products, Rev. 10
Freescale Semiconductor
83
3.7.8
Enhanced Secured Digital Host Controller (eSDHCv2) Timing
Figure 54 shows eSDHCv2 timing, and Table 61 describes the timing parameters (SD1–SD8) used in the
figure. The following definitions apply to values and signals described in Table 61:
LS: low-speed mode. Low-speed card can tolerate clocks up to 400 kHz
FS: full-speed mode. Full-speed MMC card’s clock can reach 20 MHz; full speed SD/SDIO card
clock can reach 25 MHz
HS: high-speed mode. High-speed MMC card’s clock can reach 52 MHz; SD/SDIO card clock can
reach 50 MHz
86
SCKT rising edge to data out valid
18.0
13.0
x ck
i ck
ns
87
SCKT rising edge to data out high
impedance6
——
21.0
16.0
x ck
i ck
ns
88
SCKT rising edge to transmitter #0 drive
enable negation6
——
14.0
9.0
x ck
i ck
ns
89
FST input (bl, wr) setup time before SCKT
falling edge5
——
2.0
18.0
x ck
i ck
ns
90
FST input (wl) setup time before SCKT falling
edge
——
2.0
18.0
x ck
i ck
ns
91
FST input hold time after SCKT falling edge
4.0
5.0
x ck
i ck
ns
92
FST input (wl) to data out enable from high
impedance
21.0
ns
93
FST input (wl) to transmitter #0 drive enable
assertion
14.0
ns
94
Flag output valid after SCKT rising edge
14.0
9.0
x ck
i ck
ns
95
HCKR/HCKT clock cycle
2 x TC
15
ns
96
HCKT input rising edge to SCKT output
18.0
ns
97
HCKR input rising edge to SCKR output
18.0
ns
1 V
CORE_VDD = 1.00 ± 0.10 V; TJ = –40 °C to 125 °C, CL = 50 pF
2 In the “Characteristics” column, bl = bit length, wl = word length, wr = word length relative
3 In the “Expression” column, T
C = 7.5 ns.
4 For the internal clock, the external clock cycle is defined by Icyc and the ESAI control register.
5 The word-relative frame sync signal waveform relative to the clock operates in the same manner as the bit-length frame sync
signal waveform, but spreads starting from one serial clock before the first bit clock (same as the bit length frame sync signal),
until the second-to-last bit-clock of the first word in the frame.
6 Periodically sampled and not 100% tested.
Table 60. ESAI General Timing Requirements (continued)
No.
Characteristics1 2
Symbol
Expression3
Min.
Max.
Condition
Unit
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