CY7C64713 Datasheet

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CY7C64713
The following table provides the Slave FIFO Synchronous Packet End Strobe Parameters with Externally Sourced IFCLK.
[16]
Table 23. Slave FIFO Synchronous Packet End Strobe Parameters with Externally Sourced IFCLK
Parameter
t
IFCLK
t
SPE
t
PEH
t
XFLG
IFCLK Period
PKTEND to Clock Setup Time
Clock to PKTEND Hold Time
Clock to FLAGS Output Propagation Delay
Description
Min
20.83
8.6
2.5
13.5
Max
200
Unit
ns
ns
ns
ns
There is no specific timing requirement that needs to be met for
asserting the PKTEND pin concerning asserting SLWR.
PKTEND is asserted with the last data value clocked into the
FIFOs or thereafter. The only consideration is that the set up time
t
SPE
and the hold time t
PEH
for PKTEND must be met.
Although there are no specific timing requirements for asserting
PKTEND in relation to SLWR, there exists a specific case
condition that needs attention. When using the PKTEND to
commit a one byte or word packet, an additional timing
requirement must be met when the FIFO is configured to operate
in auto mode and it is necessary to send two packets back to
back:
鈻?/div>
In this particular scenario, the developer must assert the
PKTEND at least one clock cycle after the rising edge that
caused the last byte or word to be clocked into the previous auto
committed packet.
Figure 24
shows this scenario. X is the value
the AUTOINLEN register is set to when the IN endpoint is
configured to be in auto mode.
Figure 24
shows a scenario where two packets are being
committed. The first packet is committed automatically when the
number of bytes in the FIFO reaches X (value set in AUTOINLEN
register) and the second one byte or word short packet being
committed manually using PKTEND. Note that there is at least
one IFCLK cycle timing between asserting PKTEND and
clocking of the last byte of the previous packet (causing the
packet to be committed automatically). Failing to adhere to this
timing results in the FX2 failing to send the one byte or word short
packet.
A full packet (defined as the number of bytes in the FIFO
meeting the level set in the AUTOINLEN register) committed
automatically followed by
A short one byte or word packet committed manually using the
PKTEND pin.
鈻?/div>
Figure 24. Slave FIFO Synchronous Write Sequence and Timing Diagram
t
IFCLK
IFCLK
t
SFA
t
FAH
FIFOADR
>= t
SWR
>= t
WRH
SLWR
t
SFD
t
FDH
t
SFD
X-3
t
FDH
t
SFD
X-2
t
FDH
t
SFD
X-1
t
FDH
t
SFD
X
t
FDH
t
SFD
1
t
FDH
DATA
X-4
At least one IFCLK cycle
t
SPE
t
PEH
PKTEND
Document #: 38-08039 Rev. *E
Page 41 of 54
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