參數(shù)資料
型號: MCIMX31CJMN4DR2
廠商: Freescale Semiconductor
文件頁數(shù): 24/108頁
文件大?。?/td> 0K
描述: MPU MX31 ARM11 473-MAPBGA
標準包裝: 750
系列: i.MX31
核心處理器: ARM11
芯體尺寸: 32-位
速度: 400MHz
連通性: 1 線,EBI/EMI,I²C,MMC,SPI,SSI,UART/USART,USB OTG
外圍設(shè)備: DMA,LCD,POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器類型: ROMless
RAM 容量: 16K x 8
電壓 - 電源 (Vcc/Vdd): 1.22 V ~ 1.65 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 473-LFBGA
包裝: 帶卷 (TR)
MCIMX31C/MCIMX31LC Technical Data, Rev. 4.3
22
Freescale Semiconductor
Electrical Characteristics
When bus buffers are used, the ata_data bus buffer is special. This is a bidirectional bus buffer, so a
direction control signal is needed. This direction control signal is ata_buffer_en. When its high, the bus
should drive from host to device. When its low, the bus should drive from device to host. Steering of the
signal is such that contention on the host and device tri-state busses is always avoided.
4.3.5.1
Timing Parameters
In the timing equations, some timing parameters are used. These parameters depend on the implementation
of the ATA interface on silicon, the bus buffer used, the cable delay and cable skew. Table 21 shows ATA
timing parameters.
Table 21. ATA Timing Parameters
Name
Description
Value/
Contributing Factor1
T
Bus clock period (ipg_clk_ata)
peripheral clock
frequency
ti_ds
Set-up time ata_data to ata_iordy edge (UDMA-in only)
UDMA0
UDMA1
UDMA2, UDMA3
UDMA4
UDMA5
15 ns
10 ns
7 ns
5 ns
4 ns
ti_dh
Hold time ata_iordy edge to ata_data (UDMA-in only)
UDMA0, UDMA1, UDMA2, UDMA3, UDMA4
UDMA5
5.0 ns
4.6 ns
tco
Propagation delay bus clock L-to-H to
ata_cs0, ata_cs1, ata_da2, ata_da1, ata_da0, ata_dior, ata_diow, ata_dmack, ata_data,
ata_buffer_en
12.0 ns
tsu
Set-up time ata_data to bus clock L-to-H
8.5 ns
tsui
Set-up time ata_iordy to bus clock H-to-L
8.5 ns
thi
Hold time ata_iordy to bus clock H to L
2.5 ns
tskew1
Max difference in propagation delay bus clock L-to-H to any of following signals
ata_cs0, ata_cs1, ata_da2, ata_da1, ata_da0, ata_dior, ata_diow, ata_dmack, ata_data
(write), ata_buffer_en
7ns
tskew2
Max difference in buffer propagation delay for any of following signals
ata_cs0, ata_cs1, ata_da2, ata_da1, ata_da0, ata_dior, ata_diow, ata_dmack, ata_data
(write), ata_buffer_en
transceiver
tskew3
Max difference in buffer propagation delay for any of following signals ata_iordy, ata_data
(read)
transceiver
tbuf
Max buffer propagation delay
transceiver
tcable1
Cable propagation delay for ata_data
cable
tcable2
Cable propagation delay for control signals ata_dior, ata_diow, ata_iordy, ata_dmack
cable
tskew4
Max difference in cable propagation delay between ata_iordy and ata_data (read)
cable
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