Read Error Status (Command: 0Xfb, Data: Read 1 Byte) - Philips LPC214 Series User Manual

Philips Semiconductors
Volume 1
Table 230: Get Error Code Register bit description
Bit
3:0
4
7:5

14.9.9 Read Error Status (Command: 0xFB, Data: read 1 byte)

This command reads the 8 bit Error register from the USB device. If any of these bits is
set, there will be an interrupt to the CPU. The error bits are reset after reading the register.
Table 231: Read Error Status Register bit description
Bit
0
1
2
3
4
5
6
7
9397 750 XXXXX
User manual
Symbol Value Description
EC Error Code.
0000 No Error.
0001 PID Encoding Error.
0010 Unknown PID.
0011 Unexpected Packet - any packet sequence violation from the
specification.
0100 Error in Token CRC.
0101 Error in Data CRC.
0110 Time Out Error.
0111 Babble.
1000 Error in End of Packet.
1001 Sent/Received NAK.
1010 Sent Stall.
1011 Buffer Overrun Error.
1100 Sent Empty Packet (ISO Endpoints only).
1101 Bitstuff Error.
1110 Error in Sync.
1111 Wrong Toggle Bit in Data PID, ignored data.
EA - The Error Active bit will be reset once this register is read.
- Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
Symbol Description
PID_ERR PID encoding error or Unknown PID or Token CRC.
UEPKT Unexpected Packet - any packet sequence violation from the
specification.
DCRC Data CRC error.
TIMEOUT Time out error.
EOP End of packet error.
B_OVRN Buffer Overrun.
BTSTF Bit stuff error.
TGL_ERR Wrong toggle bit in data PID, ignored data.
Rev. 01 — 15 August 2005
UM10139
Chapter 14: USB Device Controller
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Reset
value
0x0
NA
Reset value
0
0
0
0
0
0
0
0
227