CY7C43683-15AC 查看數據表（PDF） - Cypress Semiconductor

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CY7C43683-15AC

1K/4K/16K x36 Unidirectional Synchronous FIFO with Bus Matching

Cypress Semiconductor 

CY7C43643

CY7C43663

CY7C43683

operations are not available when transferring data via

mailbox registers. Furthermore, both the word- and byte-size

bus selections limit the width of the data bus that can be used

for mail register operations. In this case, only those byte lanes

belonging to the selected word- or byte-size bus can carry

mailbox data. The remaining data outputs will be indeter-

minate. The remaining data inputs will be don’t care inputs. For

example, when a word-size bus is selected, then mailbox data

can be transmitted only between A0–17 and B0–17. When a

byte-size bus is selected, then mailbox data can be trans-

mitted only between A0–8 and B0–8.

Bus-Matching FIFO Reads

Data is read from the FIFO RAM in 36-bit long-word incre-

ments. If a long-word bus size is implemented, the entire long-

word immediately shifts to the FIFO output register. If byte or

word size is implemented on Port B, only the first one or two

bytes appear on the selected portion of the FIFO output

register, with the rest of the long-word stored in auxiliary

registers. In this case, subsequent FIFO reads output the rest

of the long-word to the FIFO output register.

When reading data from the FIFO in the byte or word format,

the unused B0–35 outputs are indeterminate.

Retransmit (RT)

The retransmit feature is beneficial when transferring packets

of data. It enables the receipt of data to be acknowledged by

the receiver and retransmitted if necessary. Retransmit

function applies to CY standard mode only.

The number of 36-/18-/9-bit words written into the FIFO should

be less than full depth minus 2/4/8 words between the reset of

the FIFO (master or partial) and Retransmit setup. A LOW

pulse on RT resets the internal read pointer to the first physical

location of the FIFO. CLKA and CLKB may be free-running but

ENB must be disabled during and tRTR after the retransmit

pulse. With every valid read cycle after retransmit, previously

accessed data is read and the read pointer is incremented until

it is equal to the write pointer. Flags are governed by the

relative locations of the read and write pointers and are

updated during a retransmit cycle. Data written to the FIFO

after activation of RT are transmitted also. The full depth of the

FIFO can be repeatedly transmitted.

Document #: 38-06021 Rev. *B

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