W6691CD WINBOND [Winbond], W6691CD Datasheet - Page 45

• Manufacturer Part Number: W6691CD
• Description: ISDN S/T Interface Transceiver
• Manufacturer: WINBOND [Winbond]

D_TAM registers, but comparisons with the SAPG or TEIG cannot be disabled.
7.5.2 Reception of Frames in D Channel
The D_RMR interrupt indicates that at least 64 bytes of data have been received and the message/ frame is
not ended. Upon D_RMR interrupt, the microprocessor reads out 32 bytes of data from the FIFO. The D_RME
interrupt indicates the last segment of a message or a message with length
length of data is less than or equal to 32 and is specified in the D_RBCL register.
D_RBCL register are 000000B.
the address field, control field and information field.
D_RFIFO and issues the Receive Message Acknowledgement command (D_CMDR: RACK bit) to explicitly
The valid address combinations are :
The receive frame address comparisons can be disabled (masked) per bit basis by setting the D_SAM and
There are two interrupt sources: Receive Message Ready (D_RMR) and Receive Message End (D_RME).
If the length of the last segment of message is 32, only D_RME interrupt is generated and the RBC4-0 bits in
The data between the opening flag and the CRC field are stored in D_RFIFO. For LAPD frame, this includes
When a D_RMR or D_RME interrupt is generated, the micro-processor must read out the data from
A 128-byte FIFO is provided in the receive direction. The data movement is handled by interrupts.
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SAP1 and TEI1
SAP1 and TEI=127
SAP2 and TEI2
SAP2 and TEI=127
SAPI=0 and TEI1
SAPI=0 and TEI2
SAPI=0 and TEI=127
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Preliminary W6691
Publication Release Date: Sep 2001
32 bytes has been received. The
Revision 1.1