Status flag operation summary

NIPPON PRECISION CIRCUITS-16

SM5907AF

Flag

Read

name

method

FLAG6

READ

Meaning

- Indicates to the CD signal processor DSP (used for error correction, de-interleaving) that a

90H

disturbance has exceeded the RAM jitter margin.

bit 7

Set

- Set according to the YFLAG input and the operating state of YFCKP and YFLGS.

FLAG6 set conditions

When YFLGS=0, YFCKP=0, YFCLK input falling edge, YFLAG=L

When YFLGS=0, YFCKP=1, YFCLK input rising edge, YFLAG=L

When YFLGS=1, YFCKP=0, YFLAG=L

When YFLGS=1, YFCKP=1, YFLAG=H

Reset

- By 90H status read

- By 80H command when MSON=ON

- After external reset

MSOVF

READ

Meaning

- Indicates once only that a write to external DRAM has caused an overflow. (When reset

90H

by the 90H status read command, this flag is reset even if the overflow condition continues.)

bit 6

Set

- When the write address (WA) exceeds the read address (RA)

Reset

- By 90H status read

- When a read address clear (MSRACL) or write address clear (MSWACL) command is issued

- After external reset

BOVF

READ

Meaning

- Indicates input data rate was too fast causing buffer overflow and loss of data

90H

Set

- When inputs a data during a buffer memory overflow

bit 5

Reset

- By 90H status read

- When a read address clear (MSRACL) or write address clear (MSWACL) command is issued

- After external reset

DCOMP

READ

Meaning

- Indicates that a compare-connect sequence is operating

90H

Set

- When a (3-pair or 2-pair) compare-connect start command is received (MSDCN2=1)

bit 3

- When a direct connect command is received (MSDCN2=0, MSDCN1=1)

Reset

- When a (3-pair or 2-pair) comparison detects conforming data

- When the connect has been performed after receiving a direct connect command

- When a compare-connect stop command (MSDCN2=0, MSDCN1=0) is received

- When a MSWREN=1 command is received (However, if a compare-connect command is

received at the same time, the compare-connect command has priority.)

- After external reset

MSWIH

READ

Meaning

- Indicates that the encode sequence has stopped due to internal factors

90H

(not microcontroller commands)

bit 2

Set

- When FLAG6 (above) is set

- When BOVF (above) is set

- When MSOVF (above) is set

Reset

- When conforming data is detected after receiving a compare-connect start command

- When the connect has been performed after receiving a direct connect command

- When a read address clear (MSRACL) or write address clear (MSWACL) command is received

- After external reset

MSRIH

READ

Meaning

- Indicates that the decode sequence has stopped due to internal factors

90H

(not microcontroller commands)

bit 1

Set

- When the valid data residual becomes 0

Reset

- By 90H status read

- When a read address clear (MSRACL) or write address clear (MSWACL) command is issued

- After external reset