參數(shù)資料
型號: PSD4235G2-A-15U
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 4M X 1 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 29/104頁
文件大?。?/td> 1114K
代理商: PSD4235G2-A-15U
Obsolete
Product(s)
- Obsolete
Product(s)
Memory blocks delailed operation
PSD4135G2, PSD4135G2V
Doc ID 7838 Rev 2
7
Memory blocks delailed operation
The PSD4135G2 and PSD4135G2V have the following memory blocks:
The main Flash memory
Secondary Flash memory
SRAM.
The memory select signals for these blocks originate from the decode PLD (DPLD) and are
user-defined in PSDsoft.
Table 21 summarizes which versions of the PSD4135G2/G2V contain which memory
blocks.
7.1
Primary Flash and secondary Flash memory description
The primary Flash memory block is divided evenly into eight sectors. The secondary Flash
memory is divided into four sectors of eight Kbytes each. Each sector of either memory can
be separately protected from program and erase operations.
Flash memory may be erased on a sector-by-sector basis and programmed word-by-word.
Flash sector erasure may be suspended while data is read from other sectors of memory
and then resumed after reading.
During a program or erase of Flash, the status can be output on the Rdy/Bsy pin of Port
PE4. This pin is set up using PSDsoft Express.
Table 21.
Memory block size and organization
Sector
number
Primary Flash memory
Secondary Flash memory
SRAM
Sector size
(x16,
Kbytes)
Sector
Select
signal
Sector size
(x16,
Kbytes)
Sector
Select
signal
SRAM size
(x16,
Kbytes)
SRAM
Select
signal
0
32
FS0
4
CSBOOT0
4
RS0
1
32
FS1
4
CSBOOT1
2
32
FS2
4
CSBOOT2
3
32
FS3
4
CSBOOT3
432
FS4
532
FS5
632
FS6
732
FS7
Total
512 Kbytes
8 sectors
64 Kbytes
4 sectors
8 Kbytes
相關(guān)PDF資料
PDF描述
PSD4235G2-A-20UI 4M X 1 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
PSD813F2A-15JI 128K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQCC52
PSD834F2VA-15MI 256K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52
PSD854F2A-90MT 256K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP52
PSD854F2A-90UT 256K X 8 FLASH, 27 I/O, PIA-GENERAL PURPOSE, PQFP64
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