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參數(shù)資料
| 型號： | CSR2930800BA |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | FLASH MEMORY CMOS 8M (1M x 8/512K x 16) BIT |
| 中文描述： | 閃存的CMOS 800萬（100萬x 8/512K × 16）位 |
| 文件頁數(shù)： | 15/50頁 |
| 文件大?。?/td> | 475K |
| 代理商： | CSR2930800BA |
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CSR2930800BA
-90
15
Byte 0 (A
0
= V
IL
) represents the manufacturer’s code (04h) and (A
0
= V
IH
) represents the device identifier code
(CSR2930800BA = 5Bh for
×
8 mode; CSR2930800BA = 225Bh for
×
16 mode). These two bytes/words are given
in "CSR2930800BA Sector Protection Verify Autoselect Codes Table" and "Expanded Autoselect Code Table"
(
I
DEVICE BUS OPERATION). All identifiers for manufactures and device will exhibit odd parity with DQ
7
defined
as the parity bit. In order to read the proper device codes when executing the autoselect, A
1
must be V
IL
. (See
“CSR2930800BA User Bus Operations Tables (BYTE
=
V
IH
and BYTE
=
V
IL
)” in
I
DEVICE BUS OPERATION.)
Write
6.
Device erasure and programming are accomplished via the command register. The contents of the register
serve as inputs to the internal state machine. The state machine outputs dictate the function of the device.
The command register itself does not occupy any addressable memory location. The register is a latch used to
store the commands, along with the address and data information needed to execute the command. The
command register is written by bringing WE to V
IL
, while CE is at V
IL
and OE is at V
IH
. Addresses are latched on
the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE,
whichever happens first. Standard microprocessor write timings are used.
Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters.
7.
Sector Protection
The CSR2930800BA feature hardware sector protection. This feature will disable both program and erase
operations in any number of sectors (0 through 18). The sector protection feature is enabled using programming
equipment at the user’s site. The devices are shipped with all sectors unprotected.
To activate this mode, the programming equipment must force V
ID
on address pin A
9
and control pin OE, (suggest
V
ID
= 11.5 V), CE = V
IL
, and A
6
= V
IL
. The sector addresses (A
18
, A
17
, A
16
, A
15
, A
14
, A
13
, and A
12
) should be set to
the sector to be protected. "CSR2930800BA Standard Command Definitions Table" and "CSR2930800BA
Extended Command Definitions Table" in
I
DEVICE BUS OPERATION define the sector address for each of the
nineteen (19) individual sectors. Programming of the protection circuitry begins on the falling edge of the WE
pulse and is terminated with the rising edge of the same. Sector addresses must be held constant during the
WE pulse. See “13. AC Waveforms for Sector Protection Timing Diagram” in
I
SWITCHING WAVEFORMS and
“5. Sector Protection Algorithm” in
I
FLOW CHART for sector protection waveforms and algorithm.
To verify programming of the protection circuitry, the programming equipment must force V
ID
on address pin A
9
with CE and OE at V
IL
and WE at V
IH
. Scanning the sector addresses (A
18
, A
17
, A
16
, A
15
, A
14
, A
13
, and A
12
) while
(A
6
, A
1
, A
0
) = (0, 1, 0) will produce a logical “1” code at device output DQ
0
for a protected sector. Otherwise the
devices will read 00h for unprotected sector. In this mode, the lower order addresses, except for A
0
, A
1
, and A
6
are DON’T CARES. Address locations with A
1
= V
IL
are reserved for Autoselect manufacturer and device codes.
A
-1
requires to apply to V
IL
on byte mode.
It is also possible to determine if a sector is protected in the system by writing an Autoselect command. Performing
a read operation at the address location XX02h, where the higher order addresses (A
18
, A
17
, A
16
, A
15
, A
14
, A
13
,
and A
12
) are the desired sector address will produce a logical “1” at DQ
0
for a protected sector. See
"CSR2930800BA Sector Protection Verify Autoselect Codes Table" and "Expanded Autoselect Code Table" in
I
DEVICE BUS OPERATION for Autoselect codes.
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