PC97338VLJ datasheet(168/221 Pages) NSC

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5.16.5 TXFLV – TX_FIFO Level, Read-

Only

This register returns the number of bytes in the

TX_FIFO. It can be used for software debugging, or

during recovery from a transmitter underrun condition

in one of the high-speed infrared modes.

FIGURE 88. Transmit FIFO Level

5.16.6 RXFLV – RX_FIFO Level, Read-

Only

This register returns the number of bytes in the

RX_FIFO. It can be used for software debugging.

FIGURE 88. Receive FIFO Level

Note: The contents of TXFLV and RXFLV are not fro-

zen during CPU reads. Therefore, invalid data could

be returned if the CPU reads these registers during

normal transmitter and receiver operation. To obtain

correct data, the software should perform three con-

secutive reads and then take the data from the sec-

ond read, if first and second read yield the same

result, or from the third read, if first and second read

yield different results.

5.17 BANK 3

TABLE 85. Bank 3 Register Set

5.17.1 MID – Module Identification

When read, it returns the module revision.

The returned value is 2Xh.

5.17.2 SH_LCR – Link Control Register

Shadow, Read Only

This register returns the value of the LCR register.

The LCR register is written into when a byte value

with bit 7 set to 0 is written to the LCR/BSR registers

location (at offset 3) from any bank.

5.17.3 SH_FCR – FIFO Control Register

Shadow, Read-Only

This register returns the value written into the FCR

5.17.4 LCR/BSR – Link Control/Bank

Select Registers

These registers are the same as in bank 0.

B5–0 TFL [5–0] – Number of bytes in TX_FIFO.

B7–6 Reserved.

Return 0's.

B5–0 RFL [5–0] – Number of bytes in RX_FIFO.

B7–6 Reserved.

Return 0's.

321

Reset

Required

TFL2

TFL4

TFL5

Reserved

TFL0

TFL1

TFL3

321

Reset

Required

RFL2

RFL4

Reserved

RFL0

RFL1

RFL3

RFL5

Address

Offset

Name

Description

00h

MRID

Module Identification Register

01h

SH_LCR

Shadow of LCR Register

(Read Only)

02h

SH_FCR

Shadow of FIFO Control

03h

LCR/

BSR

Link Control Register/

Bank Select Registers

04h-07h

Reserved

PC97338VLJ 데이터시트(PDF) 168 Page - National Semiconductor (TI)

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