CY7C43686-15AC 查看數據表（PDF） - Cypress Semiconductor

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CY7C43686-15AC

1K/4K/16K x36/x18/x2 Tri Bus FIFO

Cypress Semiconductor 

CY7C43646

CY7C43666

CY7C43686

Bus-Matching FIFO1 Reads

Data is written to the FIFO1 RAM in 36-bit long-word incre-

ments. If byte or word size is implemented on Port B, only the

first one or two bytes appear on the selected portion of the

FIFO1 output register, with the rest of the long-word stored in

auxiliary registers. In this case, subsequent FIFO1 reads

output the rest of the long-word to the FIFO1 output register.

When reading data from FIFO1 as byte, the unused B9-17

outputs are indeterminate.

Bus-Matching FIFO2 Writes

Data is written to the FIFO2 RAM in 18-bit word increments.

Data written to FIFO2 with a byte or word bus size stores the

initial bytes or words in auxiliary registers. The CLKC rising

edge that writes the word to FIFO2 also stores the entire

long-word in FIFO2 RAM.

When reading data from FIFO2 in byte format, the unused

C8–17 outputs are LOW.

Retransmit (RT1, RT2)

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 RT1, (RT2) resets the internal read pointer to the first

physical location of the FIFO. CLKA and CLKB may be free

running but RENB and (ENA) 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 RT1, (RT2) are trans-

mitted also.

The full depth of the FIFO can be repeatedly retransmitted.

Document #: 38-06023 Rev. *C

Page 10 of 39

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