PSD4235G2-90U STMicroelectronics, PSD4235G2-90U Datasheet - Page 71
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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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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Part Number:
PSD4235G2-90U
Manufacturer:
MURATA
Quantity:
34 000
Company:
Part Number:
PSD4235G2-90U
Manufacturer:
STMicroelectronics
Quantity:
10 000
Part Number:
PSD4235G2-90U
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
PSD4235G2-90UI
Manufacturer:
TI
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Company:
Part Number:
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Manufacturer:
STMicroelectronics
Quantity:
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PSD4235G2
19.2
Figure 19. An example of a typical 16-bit non-multiplexed bus interface
19.3
RESET
MCU
PSD interface to a non-multiplexed 8-bit bus
Figure 19
and a PSD4235G2. The address bus is connected to the ADIO Port, and the data bus is
connected to Ports F and G. Ports F and G are in tri-state mode when the PSD is not
accessed by the MCU. Should the system address bus exceed sixteen bits, Ports A, B, or C
may be used for additional address inputs.
Data Byte Enable reference
MCUs have different data byte orientations.
interprets byte/word operations in different bus write configurations. Even-byte refers to
locations with address A0 equal to '0,' and odd byte as locations with A0 equal to '1.'
Table 35.
BHE
BHE
ALE
WR
RD
0
0
1
shows an example of a system using a MCU with a 16-bit non-multiplexed bus
16-bit data bus with BHE
D [ 15:0 ]
A [ 15:0 ]
A0
0
1
0
Odd Byte
Odd Byte
—
PSD
WR ( CNTRL0 )
RD ( CNTRL1 )
BHE ( CNTRL2 )
RST
ALE ( PD0 )
PORT D
PORT
ADIO
D15-D8
Table 35
PORT
PORT
PORT
to
G
F
A
Table 38
Even Byte
—
Even Byte
show how the PSD4235G2
( OPTIONAL )
D[15:8] 1
D [ 7:0 ]
A [ 23:16 ]
MCU bus interface
D7-D0
AI04929
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