PSD4235G2-90U STMicroelectronics, PSD4235G2-90U Datasheet - Page 69

• 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

PSD4235G2
19
MCU bus interface
The “no-glue logic” MCU Bus Interface block can be directly connected to most popular
MCUs and their control signals. Key 16-bit MCUs, with their bus types and control signals,
are shown in
Table 34.
1. ALE/AS input is optional for MCUs with a non-multiplexed bus
2. Unused CNTL2 pin can be configured as CPLD input. Other unused pins (PD3-PD0, PF3-PF0) can be
68302, 68306, MMC2001
68330, 68331, 68332,
68340
68LC302, MMC2001
68HC16
68HC912
68HC812
80196
80196SP
80186
80C161, 80C164-80C167
80C51XA
H8/300
M37702M2
configured for other I/O functions.
3
MCU
MCUs and their control signals
Table
34. The MCU interface type is specified using the PSDsoft Express.
CNTL0
WRL
WRL
WRL
WEL
R/W
R/W
R/W
R/W
R/W
R/W
WR
WR
WR
CNTL1
LDS
DS
OE
DS
RD
RD
RD
RD
RD
RD
E
E
E
(Note
CNTL2
LSTRB
LSTRB
PSEN
UDS
SIZ0
SIZ0
BHE
BHE
BHE
BHE
—
(2)
1
)
WEH
WRH
WRH
WRH
PD3
DBE
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(Note
PD0
ALE
ALE
ALE
ALE
ALE
ALE
AS
AS
AS
AS
AS
E
(1)
1
)
MCU bus interface
ADIO0
A4/D0
A0
A0
A0
A0
A0
A0
A0
A0
A0
A0
—
—
A3-A1
PF3-
PF0
69/129
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
—
(2)