SM5902AF datasheet(19/40 Pages) NPC

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NIPPON PRECISION CIRCUITS-19

SM5902AF

Flag

Read

name

method

MSEMP

READ

Meaning

- Indicates that the valid data residual has become 0

91H

Set

- When the VWA (final valid data's next address)

bit 7

= RA (address from which the next read would take place)

Reset

- Whenever the above does not apply

OVFL

READ

Meaning

- Indicates a write to external DRAM overflow state

91H

Set

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

bit 6

(Note: This flag is not set when WA=RA through an address initialize or reset operation.)

Reset

- When the read address (RA) is advanced by the decode sequence

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

- After external reset

ENCOD

READ

Meaning

- Indicates that the encode sequence (input data entry, encoding, DRAM write) is operating

91H

Set

- By the 80H command when MSWREN=1

bit 5

- When conforming data is detected during compare-connect operation

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

Reset

- When the FLAG6 flag=1 (above)

- When the OVFL flag=1 (above)

- By the 80H command when MSWREN=0

- By the 80H command when MSDCN1=1 or MSDCN2=1 (compare-connect start command)

- By the 80H command when MSON=0

- After external reset

Note. Reset conditions have priority over set conditions. For example, if the 80H command has

MSWREN=1 and MSDCN1=1, the ENCOD flag is reset and compare-connect operation starts.

DECOD

READ

Meaning

- Indicates that the decode sequence (read from DRAM, decoding,

91H

attenuation, data output) is operating

bit 4

Set

- By a new 80H command when MSRDEN=1 and the MSEMP flag=0 (above)

Reset

- Whenever the above does not apply

QRDY

READ

Meaning

Subcode Q data write-buffer write enable indicator

91H

Set

After internal subcode Q data write-buffer contents are read out.

bit 3

Reset

When data is written to address 1001 using the 87H command.

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