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參數(shù)資料
| 型號(hào)： | 82802AB |
| 廠商： | Intel Corp. |
| 英文描述： | Firmware Hub (FWH) |
| 中文描述： | 固件集線器（固件樞紐） |
| 文件頁(yè)數(shù)： | 42/53頁(yè) |
| 文件大?。?/td> | 471K |
| 代理商： | 82802AB |
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Intel
82802AB/AC Firmware Hub
R
42
Datasheet
5.4.1.2.
Single-Byte Read Waveforms
Figure 10.
FWH Single-Byte Read Waveforms
IMADDR
STR
CLK
FWH[3:0]
FWH4
IDS
IMS
TAR
SYNC(3)
DATA
TAR
5.4.1.3.
Write Cycle Sequence
The firmware hub only supports single-byte writes. Each byte represents either the data to be written or a
valid flash command. Refer to the waveforms in Figure 11.
Table 17.
FWH Write Cycle
Clock
Cycle
Field
Name
Field Contents
1
FWH[3:0]
FWH[3:0]
Direction
Comments
1
START
1110
IN
FWH4 must be active (low) for the part to respond.
Only the last start field (before FWH4 transitioning
high) should be recognized. The START field
contents indicate an FWH memory write cycle.
2
IDSEL
0000
to
1111
IN
Indicates which FWH device should respond. If the
IDSEL (ID select) field matches the value ID[3:0],
then that particular device will respond to subsequent
commands.
3-9
IMADDR
YYYY
IN
These seven clock cycles make up the 28-bit
memory address. YYYY is one nibble of the entire
address. Addresses are transferred most-significant
nibble first.
10
IMSIZE
0000 (1 byte)
IN
This size field indicates how many bytes will be
transferred during read/write operations. The FWH
only supports single-byte writes.
11
DATA
YYYY
IN
This field is the least-significant nibble of the data
byte. This data is either the data to be programmed
into the flash memory or any valid flash command.
12
DATA
YYYY
IN
This field is the most-significant nibble of the data
byte.
13
TAR0
1111
IN
then float
In this clock cycle, the master (Intel ICH) has driven
the bus to all 1s and then floats the bus prior to the
next clock cycle. This is the first part of the bus
“turnaround cycle.”
14
TAR1
1111 (float)
Float then
OUT
The FWH takes control of the bus during this cycle.
During the next clock cycle it will be driving the “sync”
data.
15
RSYNC
0000
OUT
The FWH outputs the values 0000, indicating that it
has received data or a flash command.
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