TC5299J Datasheet, PDF (18/32 Pages) List of Unclassifed Manufacturers – FAST ETHERNET PCMCIA LAN CONTROLLER

TC5299J
Page 3 Address Assignments (PS1=1,PS0=1)
A0-A3
RD
0CH Reserved
0DH Reserved
0EH Reserved
0FH Reserved
WR
Reserved
Reserved
Reserved
Reserved
5.7 Register Descriptions
5.7.1 Command Register (CR)
00H (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
Symbol
D0
STP
D1
STA
D2
TXP
D3-D5 RD0-RD2
D6,D7 PS0,PS1
Description
Stop: Software reset command, take 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 has executed only when indicated by the RST bit in the
ISR being set to a 1. STP powers up high.
Start: This bit is used to active the TC5299J core after either power up, or when the
TC5299J core 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
RD1
RD0
0
0
0
Not Allowed
0
0
1
Remote Read
0
1
0
Remote Write (Note)
0
1
1
Send Packet
1
X
X
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
Register Page 0
-18-
Ver. 0.1
07/04/01