TC3299A Datasheet, PDF (15/26 Pages) List of Unclassifed Manufacturers – Ethernet PCMCIA Controller + COMBO Transceiver

TC3299A
Preliminary Data Sheet
REGISTER DESCRIPTIONS: Command Register (CR) (Read/Write)
The Command Register is used to initiate transmissions, enable or disable Remote DMA operations and
to select register pages. To issue a command the microprocessor sets the corresponding bit(s) (RD2,
RD1, RD0, and TXP). Further commands may be overlapped, but with the following rules:(1) if a transmit
command overlaps with a remote DMA operation, bits RD0, RD1, and RD2 must be maintained for the
remote DMA command when setting the TXP bit. Note, if a remote DMA command is re-issued when
giving the transmit command, the DMA will complete immediately if the remote byte count register have
not been reinitialized. (2) If a remote DMA operation overlaps a transmission, RD0, RD1, and RD2 may
be written with the desired values and a ”0”to this bit has no effect. (3) A remote write DMA may not
overlap remote read operation or visa versa. Either of these operations must either complete or be
aborted before the other operation may start. Bits PS1, PS0, RD2, and STP may be set any time.
7
6
5
4
3
2
1
0
PS1
PS0
RD2
RD1
RD0
TXP
STA
STP
Bit
D0
D1
D2
D3-D5
D6,D7
Symbol
STP
STA
TXP
RD0-RD2
PS0,PS1
Description
Stop: Software reset command, takes the controller offline, no packets will
be received or transmitted. Any reception of transmission in progress will
continue to completion before entering the reset state. To exit this state,
the STP bit must be reset. The software reset is executed only when the
RST bit in the ISR being set to a 1. STP powers up high.
Start: This bit is used to active the EPCC core after either power up, or
when the EPCC cord has been placed in a reset mode by software
command. STA power up low.
Transmit Packet: This bit must be set to initiate transmission of a packet.
TXP is internally reset either after the transmission is completed or
aborted. This bit should be set only after the Transmit Byte Count and
Transmit Page Start registers have been programmed. TXP powers up low.
Remote DMA Command: These three encoded bits control operation of
the Remote DMA channel. RD2 can be set to about any Remote DMA
command in progress. The Remote Start Addresses are not restored to
the starting address if the Remote DMA is aborted. RD2 powers up high.
RD2
0
0
0
0
1
RD1
0
0
1
1
X
RD0
0
1
0
1
X
Not Allowed
Remote Read
Remote Write (Note)
Send Packet
Abort/Complete Remote DMA (Note)
Page Select: Three two encoded bits select which register page is to be
accessed with addresses A0-3.
PS1 PS0
0
0
0
1
1
0
1
1
Register Page 0
Register Page 1
Register Page 2
Register Page 3
Data Configure register (DCR)
This Register is used to program the EPCC for 8 or 16-bit memory interfaces, select byte ordering in
16-bit applications and establish FIFO thresholds. The DCR must be initialized prior to load the Remote
Byte count Registers.
Confidential.
Copyright © 2003, IC Plus Corp.
15/26
August 27, 20003
TC3299A-DS-R30