CY7C43643-10AC Cypress Semiconductor Corp, CY7C43643-10AC Datasheet - Page 9

• Manufacturer Part Number: CY7C43643-10AC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C43643-10AC

• Density: 32Kb
• Word Size: 36b
• Sync/async: Synchronous
• Expandable: Yes
• Package Type: TQFP
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 128
• Lead Free Status / Rohs Status: Not Compliant

Document #: 38-06021 Rev. *B
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 A
byte-size bus is selected, then mailbox data can be trans-
mitted only between A
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.
0–8
and B
0–8
.
0–17
and B
0–17
. When a
When reading data from the FIFO in the byte or word format,
the unused B
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 t
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.
0–35
outputs are indeterminate.
RTR
CY7C43643
CY7C43663
CY7C43683
after the retransmit
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