NIPPON PRECISION CIRCUITS-18

SM5906AF

Flag

Read

name

method

MSRIH

READ

Meaning

– Indicates that the read 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 recieved

– After external reset

SYNCWAR READ

Meaning

– Indicates residual is not updated because sync data not verified for 1 block

90H

Set

– When sync data is not verified for 1 block (C2PO error etc.)

bit 0

– When sync data does not occur within a 2352-byte interval

Reset

– By 90H status read

– After external reset

– When MSWACL, MSRACL are issued

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 read sequence

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

– After external reset

WRSQ

READ

Meaning

– Indicates that the write sequence (input data entry, 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)

– When the BOVF 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. However, simultaneous MSWREN = 1

and compare-connect operation has precedence over WRSQ.

RDSQ

READ

Meaning

– Indicates that the read sequence (read from DRAM, data output) is operating

91H

Set

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

bit 4

Reset

– Whenever the above does not apply