DSP56857 datasheet(354/662 Pages) FREESCALE

354 / 662 page

5685X Digital Signal Controller User Manual, Rev. 4

12-54

Freescale Semiconductor

12.8.13 ESSI FIFO Control/Status Register (SFCSR)

This register allows configuration of the Transmit and Receive FIFO Registers, and allows

reporting of the amount of data contained in each FIFO

Figure 12-28. ESSI FIFO Control/Status Register (SFCSR)

See Programmer’s Sheet on Appendix page B - 80

12.8.13.1 Receive FIFO Counter (RFCNT)—Bits 15–12

This read-only bit field indicates the number of data words in the RXFIFO. Table 12-19

demonstrates the RFCNT bit field encoding.

12.8.13.2 Transmit FIFO Counter (TFCNT)—Bits 11–8

This read-only bit field indicates the number of data words in the TXFIFO. Table 12-20

illustrates the TFCNT bit field encoding. The specific FIFO reported on is determined by the first

TXSFn control bit enabled; that is to say, if TXSF0 is set, the number of data words in TXFIFO0

is reported. When more than one transmitter is enabled, the TF1ERR and TF2ERR status bits will

indicate any counter mismatches, described in Section 12.8.7.

Base +$B

Read

RFCNT

TFCNT

RFWM

TFWM

Write

Reset

Table 12-19.

RFCNT Encoding

Bits

Description

0000

0 Data words in RXFIFO

0001

1 Data words in RXFIFO

0010

2 Data words in RXFIFO

0011

3 Data words in RXFIFO

0100

4 Data words in RXFIFO

0101

5 Data words in RXFIFO

0110

6 Data words in RXFIFO

0111

7 Data words in RXFIFO

1000

8 Data words in RXFIFO

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