TC3299A Datasheet, PDF (23/26 Pages) List of Unclassifed Manufacturers – Ethernet PCMCIA Controller + COMBO Transceiver

TC3299A
Preliminary Data Sheet
(I) Local DMA Transmit Registers
Transmit page start register (TPSR):
This register points to the assembled packet to be transmitted. Only the eight higher order addresses are
specified ince all transmit packets are assembled on 256-byte page boundaries.
7
6
5
4
3
2
1
0
A15 A14 A13 A12 A11 A10
A9
A8
Transmit byte count register0,1 (TBCR0,TBCR1):
These two registers indicate the length of the packet to be transmitted in bytes. The maximum number of
transmit bytes allowed is 64k bytes. The EPCC will not truncate transmissions longer than 1500 bytes.
7
6
5
4
3
2
1
0
TBCR1 L15
L14
L13
L12
L11
L10
L9
L8
7
6
5
4
3
2
1
0
TBCR0 L7
L6
L5
L4
L3
L2
L1
L0
(II) Local DMA Receive Registers
Page start, stop registers (PSTART, STOP):
The Page Start and Page stop Registers program the starting and stopping page of the Receive Buffer
Ring. Since the EPCC uses fixed 256-byte buffers aligned on page boundaries only the upper eight bits of
the start and stop address are specified.
7
6
5
4
3
2
1
0
PSTART A15 A14 A13 A12 A11 A10
A9
A8
PSTOP
Boundary register (BNRY):
This register is used to prevent overflow of the Receive Buffer Ring. Buffer management compares the
contents of this register to the next buffer address when linking buffers together. If the contents of this
register match the next buffer address the local DMA operation is aborted.
7
6
5
4
3
2
1
0
BNRY
A15 A14 A13 A12 A11 A10
A9
A8
(III) Remote DMA registers
Remote Start Address Registers (RSAR0,1):
Remote Byte Count Registers (RBCR0,1):
Remote DMA operations are programmed via the Remote Start Address (RSAR0,1) and Remote Byte
Count (RBCR0,1) registers. The Remote Start Address is used to point to the start of the block of data to
be transferred and the Remote Byte Count is used to indicate the length of the block (in bytes).
7
6
5
4
3
2
1
0
RSAR1 A15 A14 A13 A12 A11 A10
A9
A8
7
6
5
4
3
2
1
0
RSAR0 A7
A6
A5
A4
A3
A2
A1
A0
Confidential.
Copyright © 2003, IC Plus Corp.
23/26
August 27, 20003
TC3299A-DS-R30