LH543620P-25 Просмотр технического описания (PDF) - Sharp Electronics
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LH543620P-25 Datasheet PDF : 38 Pages
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LH543620
1024 × 36 Synchronous FIFO
PIN NAME
DESCRIPTION
CONTROL SIGNALS SYNCHRONOUS TO THE OUTPUT CLOCK (cont’d)
WSO[1:0]
Output-Port Word-Width Selection. WSO[1:0] is synchronous to the rising edge of CKO.
WSO[1:0] selects the Output-Port Word-Width and controls byte-order-reversal according to
Table 5.
RTMD[1:0]
Retransmit Mode Control. RTMD[1:0] is synchronized to the rising edge of CKO. RTMD[1:0]
controls the placement of new contents into the Read Pointer (RP) and/or the Retransmit Base
(RBASE) registers. Whenever Retransmit (RT) is asserted, one of three operations is performed
according to the setting of RTMD[1:0]. See Table 6.
NOTES:
1. When RTMD[1:0] is set to 0, the FIFO is in depth cascade mode, and the Retransmit
mechanism can not be used. In cascade mode, the Almost-Empty Flag is a handshake signal for
cascading. The Almost-Empty Flag is used as an input to the ENI of the next FIFO in the chain.
2. In standard FIFO operation RTMD[1:0] must not be set to 0 and the Retransmit signal must be
HIGH.
Retransmit. RT is synchronized to the rising edge of CKO. When asserted LOW, RT causes one
RT
of the Retransmit Mode operations to be performed, according to the encoding of RTMD[1:0]. See
Table 6.
NOTE: When RTMD[1:0] = 0 (FIFO is in cascade mode) RT is ignored.
Table 5. Output-Port Word-Width Selection
WSO1 WSO0
FUNCTION
L
L
9-Bit Data-Path
Width
Output data Q[8:0]
L
H
18-Bit Data-Path
Width
Output data Q[17:0]
36-Bit Data-Path
H L Width With Byte- Output data Q[35:0]
Order-Reversal
H
H
36-Bit Data-Path
Width
Output data Q[35:0]
Table 6. Retransmit Operation Modes
RTMD1 RTMD0 OPERATION
ACTION TAKEN
Depth
The Almost-Empty
L
L Cascade Flag is a handshake
Mode
signal for cascading
L
H
Retransmit
(RBASE) +
(ROFFSET) ¡ RP
(RBASE) +
(ROFFSET) ¡ RP
H
L
Retransmit and
and Mark (RBASE) +
(ROFFSET) ¡
RBASE
H
H Mark
(RP) ¡ RBASE
12
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