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参数资料
| 型号： | RC28F256P33T85A |
| 厂商： | NUMONYX |
| 元件分类： | PROM |
| 英文描述： | 16M X 16 FLASH 3V PROM, 85 ns, PBGA64 |
| 封装： | BGA-64 |
| 文件页数： | 43/96页 |
| 文件大小： | 1378K |
| 代理商： | RC28F256P33T85A |
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Numonyx StrataFlash Embedded Memory (P33)
Datasheet
November 2007
48
Order Number: 314749-05
11.0
Device Operations
This section provides an overview of device operations. The system Central Processing
Unit provides control of all in-system read, write, and erase operations of the device via
the system bus. The on-chip WSM manages all block-erase and word-program
algorithms.
Device commands are written to the CUI to control all flash memory device operations.
The CUI does not occupy an addressable memory location; it is the mechanism through
which the flash device is controlled.
11.1
Status Register
To read the Status Register, issue the Read Status Register command at any address.
Status Register information is available to which the Read Status Register, Word
Program, or Block Erase command was issued. SRD is automatically made available
following a Word Program, Block Erase, or Block Lock command sequence. Reads from
the device after any of these command sequences outputs the device’s status until
another valid command is written (e.g. the Read Array command).
The Status Register is read using single asynchronous-mode or synchronous burst
mode reads. SRD is output on DQ[7:0], while 0x00 is output on DQ[15:8]. In
asynchronous mode the falling edge of OE#, or CE# (whichever occurs first) updates
and latches the Status Register contents. However, when reading the Status Register in
synchronous burst mode, CE# or ADV# must be toggled to update SRD.
The Device Write Status bit (SR[7]) provides overall status of the device. SR[6:1]
present status and error information about the program, erase, suspend, VPP, and
block-locked operations.
Table 25: Status Register Description (Sheet 1 of 2)
Status Register (SR)
Default Value = 0x80
Device Write
Status
Erase
Suspend
Status
Erase Status
Program
Status
VPP Status
Program
Suspend
Status
Block-Locked
Status
BEFP
Write
Status
DWS
ESS
ES
PS
VPPS
PSS
BLS
BWS
76
5432
10
Bit
Name
Description
7
Device Write Status (DWS)
0 = Device is busy; program or erase cycle in progress; SR[0] valid.
1 = Device is ready; SR[6:1] are valid.
6
Erase Suspend Status (ESS)
0 = Erase suspend not in effect.
1 = Erase suspend in effect.
5
Erase Status (ES)
0 = Erase successful.
1 = Erase fail or program sequence error when set with SR[4,7].
4
Program Status (PS)
0 = Program successful.
1 = Program fail or program sequence error when set with SR[5,7]
3VPP Status (VPPS)
0 = VPP within acceptable limits during program or erase operation.
1 = VPP < VPPLK during program or erase operation.
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