USB97C201 datasheet(38/59 Pages) SMSC

38 / 59 page

SMSC DS – USB97C201

Page 38

Rev. 03/25/2002

PRELIMINARY

USB_ERR

(0xDA - RESET=0x00)

USB ERROR REGISTER

BIT

NAME

R/W

DESCRIPTION

has been received on an endpoint.

Note: Writing a “1” to a bit in this register will clear the bit.. If any bit is set in this register the USB_ERR bit is set in

the USB_STAT register.

Table 51 – MSB ATA Data Register

MSB_ATA

(0xDB - RESET=0x00)

MSB ATA CONTROL/STATUS DATA REGISTER

BIT

NAME

R/W

DESCRIPTION

[7:0]

D[15:8]

R/W

During 8051 writes to XDATA 0x31F0 (the ATA Drives

Control/Status register), data in this register represents the

MS byte of the 16 bit operation to this address. For a read

of 0x31F0, the MS byte data is returned in this register after

the PIO_COMPLETE bit is set in the ATA_CTL register. (the

data returned from the actual read of 31F0 should be

discarded)

Table 52 – LSB ATA Data Register

LSB_ATA

(0xDC - RESET=0x00)

LSB ATA CONTROL/STATUS DATA REGISTER

BIT

NAME

R/W

DESCRIPTION

[7:0]

D[7:0]

R/W

During 8051 reads to XDATA 0x31F1-7 and 33F6 (the ATA

Drive’s 8 bit registers), the actual data is returned in this

For 8051 read to XDATA 0x31F0, the LS byte of data is

returned in this register after the PIO_COMPLETE bit is set

in the ATA_CTL register. During writes, this register is

unused.

Table 53 – ATA Transfer Count Register 0

ATA_CNT0

(0xE1 - RESET=0x00)

ATA TRANSFER COUNT REGISTER 0

BIT

NAME

R/W

DESCRIPTION

[7:0]

D[7:0]

R/W

See note below.

Table 54 – ATA Transfer Count Register 1

ATA_CNT1

(0xE2 - RESET=0x00)

ATA TRANSFER COUNT REGISTER 1

BIT

NAME

R/W

DESCRIPTION

[7:0]

D[15:8]

R/W

See note below.

Table 55 – ATA Transfer Count Register 2

ATA_CNT2

(0xE3 - RESET=0x00)

ATA TRANSFER COUNT REGISTER 2

BIT

NAME

R/W

DESCRIPTION

[7:0]

D[23:16]

R/W

See note below.

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