USB97C201 datasheet(36/59 Pages) SMSC

36 / 59 page

SMSC DS – USB97C201

Page 36

Rev. 03/25/2002

PRELIMINARY

BIT

NAME

R/W

DESCRIPTION

[7:2]

Reserved

This bit always reads “0”.

512Bytes

1 = Indicates that 512 bytes were transferred

COUNT8

Bit 8 of the byte count for the data transferred.

Table 43 – RAM Buffer Write Byte Count Register B2 Register

RAMWRBC_B2

(0xD2 - RESET=0x00)

RAM BUFFER WRITE BYTE COUNT REGISTER B2

BIT

NAME

R/W

DESCRIPTION

[7:0]

COUNT[7:0]

Bits 7 thru 0 the byte count of the data transferred to SRAM.

The packet is stored beginning at address 0x0300.

Table 44 – RAM Buffer Read Byte Count Register A1

RAMRDBC_A1

(0xD3 - RESET=0x00)

RAM BUFFER READ BYTE COUNT REGISTER A1

BIT

NAME

R/W

DESCRIPTION

[7:2]

Reserved

This bit always reads “0”.

512Bytes

R/W

1 = Indicates that 512 bytes are to transferred

COUNT8

R/W

Bit 8 of the byte count for the data to be transferred.

Table 45 – RAM Buffer Read Byte Count Register A2 Register

RAMRDBC_A2

(0xD4 - RESET=0x00)

RAM BUFFER READ BYTE COUNT REGISTER A2

BIT

NAME

R/W

DESCRIPTION

[7:0]

COUNT[7:0]

R/W

Bits 7 thru 0 the byte count of the packet to be transferred

from the SRAM. The packet is stored beginning at address

0x0100

Table 46 – RAM Buffer Read Byte Count Register B1

RAMRDBC_B1

(0xD5 - RESET=0x00)

RAM BUFFER READ BYTE COUNT REGISTER B1

BIT

NAME

R/W

DESCRIPTION

[7:2]

Reserved

This bit always reads “0”.

512Bytes

R/W

1 = Indicates that 512 bytes are to transferred

COUNT8

R/W

Bit 8 of the byte count for the data to be transferred.

Table 47 – RAM Buffer Read Byte Count Register B2 Register

RAMRDBC_B2

(0xD6 - RESET=0x00)

RAM BUFFER READ BYTE COUNT REGISTER B2

BIT

NAME

R/W

DESCRIPTION

[7:0]

COUNT[7:0]

R/W

Bits 7 thru 0 the byte count of the packet to be transferred

from the SRAM. The packet is stored beginning at address

0x0300.

Table 48 – NAK Register (INT5)

NAK

(0xD7 - RESET=0x00)

NAK REGISTER

BIT

NAME

R/W

DESCRIPTION

NYET2RX

1 = indicates that an NYET has been sent to the host on

Endpoint 2 in response to an OUT token.

NYET0RX

1 = indicates that an NYET has been sent to the host on

Endpoint 0 in response to an OUT token.

NAK2TX

1 = indicates that an NAK has been sent to the host on

Endpoint 2 in response to an IN token.

USB97C201 Datasheet(PDF) 36 Page - SMSC Corporation

USB97C201 Datasheet(HTML) 36 Page - SMSC Corporation

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