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83C795 Datasheet(PDF) 49 Page - SMSC Corporation |
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83C795 Datasheet(HTML) 49 Page - SMSC Corporation |
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49 / 136 page  5.2.35 TBEGIN - Transmit Buffer Starting Address Register Linked-List Map R ead Port = 2:13 Linked-List Map Write Port = 0:15 T his register holds the upper 8 bits of the s tarting address of the transmit buffer des criptor table. T he lower 8 bits are as sumed to be zero. R efer to page 80 for more information. BIT TBEGIN RESET 7 TB15 X 6 TB14 X 5 TB13 X 4 TB12 X 3 TB11 X 2 TB10 X 1 TB09 X 0 TB08 X 5.2.36 TCNTH - Transmit Frame Length High Register Normal Map R ead Port = 2:16 Normal Map Write Port = 0:16 T his regis ter contains the upper 8 bits of a two-regis ter set that holds the byte count for the frame to be trans mitted. T his byte count mus t include the DA, S A, and data fields . If CR C generation is inhibited, this count mus t als o include the CR C field in the buffer. BIT TCNTH RESET 7 L15 X 6 L14 X 5 L13 X 4 L12 X 3L11 X 2 L10 X 1 L09 X 0 L08 X 5.2.37 TCNTL - Transmit Frame Length Low Register Normal Map R ead Port = 2:13 Normal Map Write Port = 0:15 T his regis ter contains the lower 8 bits of a two-regis ter set that holds the byte count for the frame to be trans mitted. T his byte count mus t include the DA, S A, and data fields . If CR C generation is inhibited, this count mus t als o include the CR C field in the buffer. BIT TCNTL RESET 7 L07 X 6 L06 X 5 L05 X 4 L04 X 3 L03 X 2 L02 X 1 L01 X 0 L00 X 5.2.38 TCON - Transmit Configuration Register Normal Map R ead Port = 2:1D Normal Map Write Port = 0:1D Linked-List MapR eadPort = 2:1D Linked-List Map Write Port = 0:1D T his regis ter controls loopback options and trans mitter mode operations . BIT TCON RESET 70 0 60 0 50 0 40 0 30 0 2 LB1 0 1 LB0 0 0 CRCN 0 Bits 2-1: LB1, LB0, Loopback Test Selection T hes etwobits aredecodedas s hown in Table5-12. 83C795 ETHERNET SYSTEM CONTROLLER REGISTERS 36 |
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