GL813 - USB2.0 CompactFlash Card Reader Controller

©2001-2002 Genesys Logic Inc.—All rights reserved.

Page 16 of 24

CRC. When transmitting, the SIE is always expected to present a PID as the first

byte of the data stream and if appropriate, CRC as the last bytes of the data stream.

The SIE must use LINEST0/1 to verify a Bus Idle condition before asserting TXVLD

in the TX Wait state.

5.1.2 Transmit Timing for Data Packet

The SIE negates TXVLD to complete a packet. Once negated, the Transmit State

Machine will never reassert TXRDY until after the EOP has been loaded into the Transmit

Shift Register. Note that the UTM Transmit State Machine can be ready to start another

package immediately, however the SIE must confirm to the minimum inter-packet delays

identified in the USB 2.0 Specification.

Data

Data

Data

Data

CRC

CRC

PID

SYNC

PID

Data

Data

Data

Data

CRC

C

CRC

C

EOP

P

CLKOUT

TXVLD

Data

TXRDY

DP/DM