IMX35 datasheet(101/148 Pages) FREESCALE

101 / 148 page

i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6

Freescale Semiconductor

101

4.9.17.3

Timing Parameters

Table 64 shows the parameters used in the timing equations. These parameters depend on the

implementation of the ATA interface on silicon, the bus buffer used, the cable delay, and the cable skew.

Table 64. ATA Timing Parameters

Name

Description

Value/

Contributing Factor1

1 Values provided where applicable.

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

7ns

5ns

4ns

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 Maximum 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 Maximum 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 Maximum difference in buffer propagation delay for any of following signals ata_iordy,

ata_data (read)

Transceiver

tbuf

Maximum 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 Maximum difference in cable propagation delay between ata_iordy and ata_data (read)

Cable

tskew5 Maximum difference in cable propagation delay between (ata_dior, ata_diow, ata_dmack)

and ata_cs0, ata_cs1, ata_da2, ata_da1, ata_da0, ata_data(write)

Cable

tskew6 Maximum difference in cable propagation delay without accounting for ground bounce

Cable

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