Philips PDIUSBD12 Product Data page 18

Philips Semiconductors
9397 750 09238
Product data
This command is useful for debugging purposes. Since it keeps track of every
transaction, the status information is overwritten for each new transaction.
See Table 9 for bit allocation.
Fig 13. Read last transaction status register.
Table 9: Read last transaction status register: bit allocation
Bit Symbol
7 PREVIOUS STATUS
NOT READ
6 DATA 0/1 PACKET
5 SETUP PACKET
4 to 1 ERROR CODE
0 DATA
RECEIVE/TRANSMIT
SUCCESS
Table 10: Error codes
Error Description
code (Binary)
0000 No Error
0001 PID encoding Error; bits 7 to 4 are not the inversion of bits 3 to 0
0010 PID unknown; encoding is valid, but PID does not exist
0011 Unexpected packet; packet is not of the type expected (= token, data or
acknowledge), or SETUP token to a non-control endpoint
0100 Token CRC Error
0101 Data CRC Error
0110 Time Out Error
0111 Never happens
1000 Unexpected End-Of-Packet
1001 Sent or received NAK
1010 Sent Stall, a token was received, but the endpoint was stalled
Rev. 08 — 20 December 2001
USB interface device with parallel bus
Description
A '1' indicates a second event occurred before the
previous status was read.
A '1' indicates the last successful received or sent packet
had a DATA1 PID.
A '1' indicates the last successful received packet had a
SETUP token (this will always read '0' for IN buffers).
See Table 10 "Error codes".
A '1' indicates data has been received or transmitted
successfully.
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
PDIUSBD12
18 of 35