ACK! dAck! 2.0 Manuel d'utilisateur télécharger pdf (Page 32)

Philips Semiconductors

ISP1581

USB 2.0 HS interface device

Objective speciﬁcation Rev. 02 — 23 October 2000 32 of 73

9397 750 07648

[1] The cycle duration for UDMA mode 3 is the same as for UDMA mode 2 (see Tabl e 87).

9.4.6 Task File registers (addresses: 40H to 4FH)

These registers allow direct access to the internal registers of an ATAPI peripheral

using PIO mode. The supported Task File registers and their functions are shown in

Table 41. The correct peripheral register is automatically addressed via pins CS1,

CS0, DA2, DA1 and DA0 (see Table 42).

Table 39: DMA Strobe Timing register: bit allocation

Bit 7 6 5 4 3 2 1 0

Symbol reserved reserved reserved DMA_STROBE_CNT[4:0]

Reset 000 1FH

Bus reset 000 1FH

Access R/W R/W R/W R/W

Table 40: DMA Strobe Timing register: bit description

Bit Symbol Description

7 to 5 - reserved.

4 to 0 DMA_

STROBE_

CNT[4:0]

These bits select the strobe duration for UDMA_MODE = 03H

(see Tabl e 35). The strobe duration is (N+1) cycles

[1]

, with N

representing the value of DMA_.STROBE_CNT.

Table 41: Task File register functions

Address (Hex) ATA function ATAPI function

1F0 data (16-bits) data (16-bits)

1F1 error/feature error/feature

1F2 sector count interrupt reason

1F3 sector number/LBA[7:0] reserved

1F4 cylinder low/LBA[15:8] cylinder low

1F5 cylinder high/LBA[23:16] cylinder high

1F6 drive/head/LBA[27:24] drive select

1F7 command status/command

3F6 alternate status/command alternate status/command

3F7 drive address reserved

Table 42: ATAPI peripheral register addressing

Task ﬁle CS1 CS0 DA2 DA1 DA0

1F0 HLLLL

1F1 HLLLH

1F2 H L L H L

1F3 H L L H H

1F4 HL HL L

1F5 HL HL H

1F6 HL HHL

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 72 73

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ACK! dAck! 2.0 Manuel d'utilisateur Page 32

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