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參數資料
| 型號： | W6690 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | ISDN S/T Interface Controller(ISDN S/T接口控制器) |
| 中文描述： | 綜合業務數字網的S / T接口控制器（綜合業務數字網S / T的接口控制器） |
| 文件頁數： | 34/76頁 |
| 文件大小： | 471K |
| 代理商： | W6690 |
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Preliminary W6690
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microprocessor must wait until transmit FIFO ready (via XFR interrupt), re-write data, and issue XMS
command to re-transmit the data.
The micro-processor can abort a frame transmission by issuing a Transmitter Reset command (XRES
bit in Bn_CMDR register). The XRES command resets the transmitter and sends inter frame time fill
pattern on B channel. It also results in a transmit pool ready condition.
Extended transparent mode:
All the data in the transmit FIFO are transmitted without any modification, i.e. no flags and CRCs are
inserted, and no bit stuffing is performed.
Transmission is started by a XMS command. The transmitter requests another block of data via XFR
interrupt when no more than a threshold length of data is left in the FIFO. The micro-processor reacts
to this condition by writing up to a threshold length of data into the transmit FIFO and issues a XMS
command to continue the message transmission.
The micro-processor reaction time depends on the FIFO threshold setting and B channel data rate.
For example, it is 4 mS if the FIFO threshold is 32 and the B channel data rate is 64 Kbps. If the
micro-processor fails to responds within the given reaction time, the transmit FIFO will hold no data to
transmit. In this case, the W6690 will automatically reset the transmitter and send the inter frame time
fill pattern on B channel. The micro-processor is informed about this via a Transmit Data Underrun
interrupt (XDUN bit in Bn_EXIR register). The microprocessor must wait until transmit FIFO ready (via
XFR interrupt), re-write data, and issue XMS command to re-transmit the data.
7.8 ISA Plug and Play Controller/Micro-processor Interface
7.8.1 Modes of Operations
The micro-processor interface provides four modes of operation:
ISA bus with Plug and Play (PNP) capability
ISA bus without PNP
8-bit Intel multiplexed address/data mode
8-bit Motorola micro-processor mode
The first mode is used in systems which supports plug and play utility. In this case, the I/O ports and
interrupt line are configured automatically by the system software. In second case, the configurations
are done manually. The third mode is used for connection to a 8 bit Intel type micro-processor and
the fourth mode is used to connect a Motorola type micro-processor.
The plug and play resource requirements are : three contiguous I/O ports and one interrupt request
line.
The serial identifier and resource data are stored in a 9346/93C46 type serial EEPROM. Only read
operation is provided by W6690. W6690 connects with this EEPROM via the following diagram:
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