PSD4235G2-90U STMicroelectronics, PSD4235G2-90U Datasheet - Page 66
PSD4235G2-90U
Manufacturer Part Number
PSD4235G2-90U
Description
IC FLASH 4MBIT 90NS 80TQFP
Manufacturer
STMicroelectronics
Datasheet
1.PSD4235G2-70U.pdf
(129 pages)
Specifications of PSD4235G2-90U
Format - Memory
FLASH
Memory Type
FLASH
Memory Size
4M (512K x 8)
Speed
90ns
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Package / Case
80-TQFP, 80-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-1968
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Complex PLD (CPLD)
Figure 15. Input macrocell
66/129
Input macrocells (IMC) are particularly useful with handshaking communication applications
where two processors pass data back and forth through a common mailbox.
shows a typical configuration where the Master MCU writes to the Port A Data Out register.
This, in turn, can be read by the Slave MCU via the activation of the “Slave-Read” output
enable product term.
The Slave can also write to the Port A input macrocells (IMC) and the Master can then read
the input macrocells (IMC) directly.
Note that the “Slave-Read” and “Slave-Wr” signals are product terms that are derived from
the Slave MCU inputs Read Strobe (RD, CNTL1), Write Strobe (WR/WRL, CNTL0), and
Slave_CS.
ENABLE ( .OE )
PT
PT
FEEDBACK
MACROCELLS A
MACROCELLS B
OUTPUT
INPUT MACROCELL _ RD
AND
MUX
D FF
LATCH
Q
Q
G
D
D
INTERNAL DATA BUS
INPUT MACROCELL
MUX
PT
ALE/AS
DIRECTION
REGISTER
DRIVER
PORT
Figure 17
PSD4235G2
AI04926
I/O PIN