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参数资料
| 型号： | ST5451D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), SERIAL COMM CONTROLLER, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 30/34页 |
| 文件大小： | 269K |
| 代理商： | ST5451D |
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2 - 2 - FIFO Structure
2 - 2 - 1 - Receive FIFO Structure
In receive direction, a 64 byte FIFO memory is
used. It is divided in 8 blocks of 8 bytes automat-
ically chained.
In case of a frame length of 64 bytes or less, the
whole frame can be stored in the FIFO. After the
first 32 bytes have been received
P is inter-
rupted and may read the available data.
In case of frames longer than 64 bytes, the
Pis
interrupted to read out the FIFO by 32 byte block.
In case of several short frames, up to eight may be
stored inside the FIFO. After an interrupt, one frame
is available for the
P. The eventual other seven
frames are queuedand transferred one by one.
2 - 2 - 2 - Transmit FIFO Structure
In transmit direction, a 64 byte FIFO memory is
used, structured in 2 blocks of 32 bytes. ST5451
is requested to transmit after 32 bytes have been
written into the FIFO.
If a transmission request does not include a mes-
sage end, the HDLC controller will request the
next data block by an interrupt.
2 - 3 - Microprocessor Interface
Three types of microprocessor interfaces are
available (MULT and I/M control pins set the de-
sired interface).
- Motorola non multiplexed families.
- Motorola multiplexed family (6805 type)
- Intel family.
You can connect ST5451 to a Direct Memory Ac-
cess Controller as MC68440 or MC6450 (dual or
quad channels).
A programmable register indicates DMA Interface
enabling.
TABLE 1 - ST5451 Internal Registers
Address Hexa
Read
Write
00
Receive FIFO
Transmit FIFO
1F
-
20
ISTA0
21
ISTA1
22
ISTA2
23
STAR
CMDR
24
MODE
25
RFBC
TSR
26
CA
27
CB
28
CC
29
CD
2A
CE
2B
CF
2C
CIR1
CIX1
2D
CIR2
CIX2
2E
MONR1
MONX1/0
2F
-
MONX1/1
30
MONR2
MONX2/0
31
-
MONX2/1
32
-
MASK0
33
-
MASK1
34
-
MASK2
3E
CCR
ST5451
5/34
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST5451L | 制造商:Valor 功能描述: |
| ST5451N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:ISDN， Other/Special/Miscellaneous |
| ST5452L | 制造商:Pulse 功能描述:- Bulk |
| ST5453L | 制造商:Pulse 功能描述:- Bulk |
| ST5454L | 制造商:Pulse 功能描述:- Bulk |
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