PC87591L datasheet(269/437 Pages) NSC

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Embedded Controller Modules (Continued)

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Debug Transmit Lock Register (DBGTXLOC)

DBGTXLOC is a byte-wide read/write register. The PID field of this register is used as a semaphore for locking the Tx chan-

nel for a specific processor. If TINT is not active (1), this register is loaded with F16 on Warm or Internal reset. If TINT is

active (0), it is not affected by a Warm or Internal reset. At Power-Up reset, the register is always loaded with 0F16. The

Location: 00 FDE416

Type: R/W

Debug Transmit Status Register (DBGTXST)

DBGTXST is a byte-wide read/write register. This register is written by a processor to indicate the message length, which is

used by the Tx data link to set the length of the serial shift register and by the processor software to define the message

length parameter. While TINT is inactive, this register may be written to at any time. While TINT is active, the contents of

this register are locked and can be read by the host via the TAP controller status word MSG_LEN field. While TINT is inac-

tive, DBGTXST is cleared on reset. While TINT is active, only Power-Up reset clears DBGTXST. The register format is

shown below.

Location: 00 FDE216

Type: R/W

Bit

76543210

Name

Reserved

PID

Reset

001111

Bit

Description

3-0

PID (Processor Index). Indicates which processor currently has control over the Tx channel. When TINT

becomes active, the value of PID is locked. On the Update_DR state of SCAN_TX instruction, PID is reset to

F16 after the host reads the data.

016-E16: Processor ID index. When the PID ﬁeld holds any of these values, write operations of values other

than F16 are ignored.

F16:

Semaphore free indication. When the PID ﬁeld holds this value, write operations may capture the Tx

for processor use.

7-4

Reserved.

Bit

76543210

Name

Reserved

MSG_LEN

Bit

00000000

Bit

Description

2-0

MSG_LEN (Message Length). The number of words in a message equals (MSG_LEN+1).

7-3

Reserved.

PC87591L Datasheet(PDF) 269 Page - National Semiconductor (TI)

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