參數(shù)資料
型號(hào)： S39421S
廠(chǎng)商： Electronic Theatre Controls, Inc.
英文描述： Hot Swap Voltage Controller
中文描述： 電壓熱插拔控制器
文件頁(yè)數(shù)： 13/28頁(yè)
文件大小： 201K
代理商： S39421S
S39421
13
2024 9.0 8/8/00
INSTRUCTION SET
Instruction
Start
Bit
Opcode
Address
x16
Data
x16
Comments
READ
1
10
x(A5
–
A0)
Read Address AN
–
A0
ERASE
1
11
x(A5
–
A0)
Clear Address AN
–
A0
WRITE
1
01
x(A5
–
A0)
D15
–
D0
Write Address AN
–
A0
EWEN
1
00
11xxxx
Write Enable
EWDS
1
00
00xxxx
Write Disable
WRAL
1
00
01xxxx
D15
–
D0
Write All Addresses
2024 PGM T5 .0
FIGURE 11. DATA DOWNLOADER SEQUENCE OF OPERATION
[note: all data download timing conforms to the timing shown in Figure 5]
Data Download Mode
The Data Download mode is an alternative method of
accessing the E
2
PROM memory. Use of this mode allows
downloading the entire contents of the memory without
entering any commands. The DD mode is enabled after a
low to high transition on the DD pin, while continuing to
assert DD (this includes powering up the device with DD
tied high). Also, as a condition to enter this mode, the
device must not be in a state of reset. Once in Data
Download mode, the device will wait until Chip Select is
driven active. At this point, the device will output a dummy
‘
0
’
followed by the contents of location 0000. As long as
the SK line is toggled the S39421 will continue to output
the contents of sequential address locations. In this
manner, the configuration data that is loaded into an
interface device can be accessed in a simple manner
without requiring the logic of the interface chip to generate
the complex signals needed for the microwire interface.
Data Download mode is exited upon the first high to low
transition of the Chip Select input.
Data From
Address 000
Data From
Address 001 Data From
Address 1FE
Data From
Address 1FF
DO
SK
CS
DD
VCC
Dummy 0
2024 ILL7.1
DD Mode
Disabled
DD Mode Enabled After
RESET is released and After
DD is Taken to Logic 1
RESET
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