參數(shù)資料
型號(hào): PSD4235G2-90UT
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 256K X 16 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁(yè)數(shù): 19/100頁(yè)
文件大?。?/td> 933K
代理商: PSD4235G2-90UT
25/100
PSD4235G2
DETAILED OPERATION
As shown in Figure 4, the PSD consists of six ma-
jor types of functional blocks:
Memory Blocks
PLD Blocks
MCU Bus Interface
I/O Ports
Power Management Unit (PMU)
JTAG-ISP Interface
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:
Primary Flash memory
Secondary Flash memory
–SRAM
The Memory Select signals for these blocks origi-
nate from the Decode PLD (DPLD) and are user-
defined in PSDsoft Express.
Table 28 sumamarizes the sizes and organisa-
tions of the memory blocks.
Table 28. Memory Block Size and Organization
Primary Flash Memory
Secondary Flash Memory
SRAM
Sector
Number
Sector Size
(x16)
Sector Select
Signal
Sector Size
(x16)
Sector Select
Signal
SRAM Size
(x16)
SRAM Select
Signal
0
32K
FS0
4K
CSBOOT0
4K
RS0
1
32K
FS1
4K
CSBOOT1
2
32K
FS2
4K
CSBOOT2
3
32K
FS3
4K
CSBOOT3
4
32K
FS4
5
32K
FS5
6
32K
FS6
7
32K
FS7
Totals
512KByte
8 Sectors
32KByte
4 Sectors
8KByte
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