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SA-1100 Developer’s Manual 11-73
Peripheral Control Module
11.8.9.7 Bits 7..6 Reserved
Bits 7..6 are reserved for future use.
Address: 0h 8000 0018 UDCCS2 Read/Write
Bit76543210
Res. FST SST TUR TPE TPC TFS
Reset00000000
Bit Name Description
0 TFS
Transmit FIFO service (read-only).
0 – Transmit FIFO has more than 8 bytes.
1 – Transmit FIFO has 8 bytes or less.
1TPC
Transmit packet complete (read/write 1 to clear).
0 – Error/status bits invalid.
1 – Transmit packet has been sent and error/status bits are valid.
2TPE
Transmit packet error (read-only).
0 – Transmit packet was received with no errors.
1 – Transmit packet has errors and the host did not issue ACK. Valid only when RPC is
set.
3TUR
Transmit FIFO underrun.
1 – Transmit FIFO experienced an underrun. Valid only when TPC is set.
4SST
Sent STALL (read/write 1 to clear).
1 – STALL handshake was sent. Valid only when TPC is set.
5FST
Force STALL (read/write).
1 – Issue STALL handshakes to IN tokens.
7..6 —
Reserved.
Always reads zero.