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参数资料
| 型号： | W6694ACD |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, ISDN CONTROLLER, PQFP48 |
| 封装： | 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48 |
| 文件页数： | 11/42页 |
| 文件大小： | 567K |
| 代理商： | W6694ACD |
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Preliminary Data Sheet
W6694A USB-ISDN S/T-Controller
-19-
Publication Release Date: May, 2001
Revision 1.03
Bit 7:
0/1 = Read/Write
Bit 4-0:
Address offset of register.
The data byte is the write data (write operation) or 00h (read operation).
7.2.4 Bulk-IN Transaction (Endpoint 2)
Bulk-IN endpoint is for retrieving register data of W6694A. It returns the registers data that are requested by most
recent Bulk-OUT data-read request. Inside the data packet, one register occupies 2 bytes. The first is register’s offset address,
the 2
nd byte is date. A maximum of 4 register data can be sent to host in one Bulk-IN packet.
Offset 0
1
2
3
4
5
6
7
address1
data1
address2
data2
address3
data3
address4
data4
7.2.5 Interrupt-IN Transaction (Endpoint 3)
Interrupt-IN endpoint is used to periodically poll device interrupt registers. W6694A use this endpoint to report
interrupt status of all interrupt sources. All four bytes data of interrupt registers will be sent to host if ISTA is not 0. If no
interrupt is detected by W6694A when received Interrupt-IN token, A NAK token will return to the USB host.
Data packet for Interrupt-IN transaction:
Offset 0
1
2
3
4
ISTA
CIR
PICR
PDATA
MOIR
7.2.6 Isochronous-OUT Transaction (Endpoint 4)
After power-on or hardware reset, all B and D channels transmit FIFO (XFIFO) are disabled. A disabled XFIFO can
not receive data from USB. But the transmitter will automatically send inter frame time fill pattern (all 1’s) to ISDN
interface. The disabled XFIFO can be enabled by command XEN on each channel. An enabled XFIFO can receive data
from USB, and send data to the USB host.
Software decides the size of data to transmit depending on available XFIFO space, which is indicated by XFR flag
carried by Isochronous-IN packet. When XFR is reported to host, it means that XFIFO has at least half of the total XFIFO
size available for that channel. Each channel has its own XFIFO and status flags.
If the incoming Isochronous-OUT packet is detected error, some action will be automatically taken for D and B channel
XFIFO. For D channel, the XFIFO is reset and automatically enabled. For B channel, the XFIFO are not reset, and the data
remained in XFIFO are still valid and will be transmitted to ISDN later. But the new incoming B channel data will be
replaced by FFh, and stored into XFIFO. The continuous FFh will later be transmitted to corresponding B channel of ISDN
interface. This Isochronous-OUT packet error will be reported to host, by setting bit ISOE of Isochronous-IN packet to 1. D
channel FIFO will recognize and only accept data within HDLC frame (including opening and closing flag), all other data
outside HDLC frame are ignored and not stored in FIFO. B channel FIFO accept any data after it is enabled.
The packet format of Isochronous-OUT is as below:
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