pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 268

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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Embedded Controller Modules
Debug Receive Status Register (DBGRXST)
DBGRXST is a byte-wide register updated by the TAP controller to reflect the PID and MSG_LEN fields of the SCAN_RX
instruction. Bits 1 to 7 of this register are read-only bits; data written to them is ignored. The register format is shown below.
Location: 00 FDE0
Type: Varies per bit
Debug Transmit Data Registers 0, 2, 4, 6, 8, 10, 12 and 14 (DBGTXD0-14)
DBGTXD0 to DBGTXD14 is a group of eight word-wide read/write registers. The DBGTXD0-14 registers are written by a
processor from the peripheral bus. A representative DBGTXDi register is shown below.
Location: Channel 0 - 00 FDD0
Type: R/W
Bit
Name
Bit
Name
15-0 TX_DATAi (Transmit Data i). Data bits i*16 through i*16+15 of the transmit buffer.
4-1
7-5
Bit
Bit
0
Type
R/W
Channel 2 - 00 FDD2
Channel 4 - 00 FDD4
Channel 6 - 00 FDD6
Channel 8 - 00 FDD8
Channel 10 - 00 FDDA
Channel 12 - 00 FDDC
Channel 14 - 00 FDDE
RO
RO
15
RX_BUSY (Receive Busy). Data link busy indication. This bit can be cleared by writing 1 to it. Writing
0 is ignored.
0: Not Busy
1: Busy
PID (Processor Index). A write operation to this field is ignored.
Bit Value
(Decimal) Description
0:
1-14:
15:
MSG_LEN. The message length equals (MSG_LEN+1). Write operations to this field are ignored.
16
7
14
Processor ID index
Invalid
All processors abort
MSG_LEN
13
16
16
16
16
16
6
16
16
16
12
11
(Continued)
5
10
9
Description
268
4
TX_DATAi
Description
8
7
3
6
PID
5
2
4
3
1
2
RX_BUSY
1
Revision 1.07
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