PSD835G2-90U STMicroelectronics, PSD835G2-90U Datasheet - Page 32

• Manufacturer Part Number: PSD835G2-90U
• Description: IC FLASH 4MBIT 90NS 80TQFP
• Manufacturer: STMicroelectronics

Specifications of PSD835G2-90U

• 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: 497-2015

Detailed operation
6
6.1
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Detailed operation
As shown in
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The functions of each block are described in the following sections. Many of the blocks
perform multiple functions, and are user configurable.
Memory blocks
The PSD has the following memory blocks:
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The Memory Select signals for these blocks originate from the Decode PLD (DPLD) and are
user-defined in PSDsoft.
Table 6.
number
Sector
Total
Memory blocks
PLD blocks
MCU bus interface
I/O ports
Power management unit (PMU)
JTAG/ISP interface
Primary Flash memory
Secondary Flash memory
SRAM
0
1
2
3
4
5
6
7
Figure
Memory block size and organization
Sector size
Primary Flash memory
(Kbytes)
512
64
64
64
64
64
64
64
64
2, the PSD consists of six major types of functional blocks:
8 sectors
Sector
Select
signal
FS0
FS1
FS2
FS3
FS4
FS5
FS6
FS7
Secondary Flash memory
Sector size
(Kbytes)
32
8
8
8
8
CSBOOT0
CSBOOT1
CSBOOT2
CSBOOT3
4 sectors
Sector
Select
signal
SRAM size
(Kbytes)
16
16
SRAM
PSD835G2
SRAM
Select
signal
RS0