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M50FW080 数据表(PDF) 20 Page - STMicroelectronics

部件名 M50FW080
功能描述  8 Mbit 1Mb x8, Uniform Block 3V Supply Firmware Hub Flash Memory
PDF  56 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

M50FW080 数据表(HTML) 20 Page - STMicroelectronics

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Bus operations
M50FW080
20/55
Figure 6.
FWH Bus Read waveforms
Table 4.
FWH Bus Read field definitions
Clock
Cycle
Number
Clock
Cycle
Count
Field
FWH0-
FWH3
Memory
I/O
Description
1
1
START
1101b
I
On the rising edge of CLK with FWH4 Low, the
contents of FWH0-FWH3 indicate the start of a
FWH Read cycle.
2
1
IDSEL
XXXX
I
Indicates which FWH Flash Memory is selected.
The value on FWH0-FWH3 is compared to the
IDSEL strapping on the FWH Flash Memory pins
to select which FWH Flash Memory is being
addressed.
3-9
7
ADDR
XXXX
I
A 28-bit address phase is transferred starting with
the most significant nibble first.
10
1
MSIZE
0000b
I
Always 0000b (only single byte transfers are
supported).
11
1
TAR
1111b
I
The host drives FWH0-FWH3 to 1111b to indicate
a turnaround cycle.
12
1
TAR
1111b
(float)
O
The FWH Flash Memory takes control of FWH0-
FWH3 during this cycle.
13-14
2
WSYNC
0101b
O
The FWH Flash Memory drives FWH0-FWH3 to
0101b (short wait-sync) for two clock cycles,
indicating that the data is not yet available. Two
wait-states are always included.
15
1
RSYNC
0000b
O
The FWH Flash Memory drives FWH0-FWH3 to
0000b, indicating that data will be available during
the next clock cycle.
16-17
2
DATA
XXXX
O
Data transfer is two CLK cycles, starting with the
least significant nibble.
18
1
TAR
1111b
O
The FWH Flash Memory drives FWH0-FWH3 to
1111b to indicate a turnaround cycle.
19
1
TAR
1111b
(float)
N/A
The FWH Flash Memory floats its outputs, the
host takes control of FWH0-FWH3.
AI03437
CLK
FWH4
FWH0-FWH3
Number of
clock cycles
START
IDSEL
ADDR
MSIZE
TAR
SYNC
DATA
TAR
11712322



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