CY7C0837AV
CY7C0830AV/CY7C0831AV
CY7C0832AV/CY7C0833AV
Document #: 38-06059 Rev. *Q
Page 5 of 28
Byte Select Operation
Pin Definitions
Left Port
Right Port
Description
A0L–A18L[1]
A0R–A18R[1]
Address Inputs.
ADSL[7]
ADSR[7]
Address Strobe Input. Used as an address qualifier. This signal should be asserted LOW
for the part using the externally supplied address on the address pins and for loading this
address into the burst address counter.
CE0L[7]
CE0R[7]
Active LOW Chip Enable Input.
CE1L[6]
CE1R[6]
Active HIGH Chip Enable Input.
CLKL
CLKR
Clock Signal. Maximum clock input rate is fMAX.
CNTENL[7]
CNTENR[7]
Counter Enable Input. Asserting this signal LOW increments the burst address counter of
its respective port on each rising edge of CLK. The increment is disabled if ADS or CNTRST
are asserted LOW.
CNTRSTL[6]
CNTRSTR[6]
Counter Reset Input. Asserting this signal LOW resets to zero the unmasked portion of
the burst address counter of its respective port. CNTRST is not disabled by asserting ADS
or CNTEN.
CNT/MSKL[6]
CNT/MSKR[6]
Address Counter Mask Register Enable Input. Asserting this signal LOW enables access
to the mask register. When tied HIGH, the mask register is not accessible and the address
counter operations are enabled based on the status of the counter control signals.
DQ0L–DQ17L[1] DQ0R–DQ17R[1] Data Bus Input/Output.
OEL
OER
Output Enable Input. This asynchronous signal must be asserted LOW to enable the DQ
data pins during Read operations.
INTLINTR
Mailbox Interrupt Flag Output. The mailbox permits communications between ports. The
upper two memory locations can be used for message passing. INTL is asserted LOW when
the right port writes to the mailbox location of the left port, and vice versa. An interrupt to a
port is deasserted HIGH when it reads the contents of its mailbox.
CNTINTL[8]
CNTINTR[8]
Counter Interrupt Output. This pin is asserted LOW when the unmasked portion of the
counter is incremented to all “1s.”
R/WL
R/WR
Read/Write Enable Input. Assert this pin LOW to write to, or HIGH to Read from the dual
port memory array.
B0L–B1L
B0R–B1R
Byte Select Inputs. Asserting these signals enables Read and Write operations to the
corresponding bytes of the memory array.
MRST
Master Reset Input. MRST is an asynchronous input signal and affects both ports.
Asserting MRST LOW performs all of the reset functions as described in the text. A MRST
operation is required at power-up.
TMS
JTAG Test Mode Select Input. It controls the advance of JTAG TAP state machine. State
machine transitions occur on the rising edge of TCK.
TDI
JTAG Test Data Input. Data on the TDI input will be shifted serially into selected registers.
TCK
JTAG Test Clock Input.
TDO
JTAG Test Data Output. TDO transitions occur on the falling edge of TCK. TDO is normally
three-stated except when captured data is shifted out of the JTAG TAP.
VSS
Ground Inputs.
VDD
Power Inputs.
Control Pin
Effect
B0
DQ0–8 Byte Control
B1
DQ9–17 Byte Control
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