PSD4235G2-90U STMicroelectronics, PSD4235G2-90U Datasheet - Page 66

• Manufacturer Part Number: PSD4235G2-90U
• Description: IC FLASH 4MBIT 90NS 80TQFP
• Manufacturer: STMicroelectronics

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

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