RTL8019AS Datasheet, PDF (13/50 Pages) List of Unclassifed Manufacturers – Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP)

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SPECIFICATION
RTL8019AS
IMR: Interrupt Mask Register (0FH; Type=W in Page0, Type=R in Page2)
All bits correspond to the bits in the ISR register. POWER UP=all 0s. Setting individual
bits will enable the corresponding interrupts.
DCR: Data Configuration Register (0EH; Type=W in Page0, Type=R in Page2)
Bit
Symbol
Description
7
-
Always 1
6, 5 FT1, FT0 FIFO threshold select bit 1 and 0.
4
ARM
Auto-initialize Remote
0: Send Packet Command not executed.
1: Send Packet Command executed.
3
LS
Loopback Select
0: Loopback mode selected. Bits 1 and 2 of the TCR must also be
programmed for Loopback operation.
1: Normal Operation
2
LAS
This bit must be set to zero. NIC only supports dual 16-bit DMA mode.
POWER UP =1
1
BOS
Byte Order Select (Not implement)
0: MS byte placed on MD15-8 and LS byte on MD7-0. (32xxx,80x86)
1: MS byte placed on MD7-0 and LS byte on MD15-8. (680x0)
0
WTS Word Transfer Select
0: byte-wide DMA transfer
1: word-wide DMA transfer
TCR: Transmit Configuration Register (0DH; Type=W in Page0, Type=R in Page2)
Bit
Symbol
Description
7
-
Always 1
6
-
Always 1
5
-
Always 1
4
OFST Collision Offset Enable.
3
ATD Auto Transmit Disable.
0: normal operation
1: reception of multicast address hashing to bit 62 disables transmitter,
reception of multicast address hashing to bit 63 enables transmitter.
2, 1 LB1, LB0
LB1
LB0
Mode
Remark
0
0
0
Normal Operation
0
1
1
Internal Lookback
1
0
2
External Lookback
1
1
3
External Lookback
0
CRC The NIC CRC logic comprises a CRC generator for transmitter and a CRC checker for
receiver. This bit controls the activity of the CRC logic. If this bit set, CRC is inhibited by
transmitter. Otherwise CRC is appended by transmitter.
Conditions
CRC Bit Mode
0
normal
1
normal
0
loopback
1
loopback
CRC Logic Activities
CRC Generator CRC Checker
enabled
enabled
disabled
enabled
enabled
disabled
disabled
enabled
8019AS.doc
13
2001-05-10