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參數(shù)資料
| 型號(hào)： | MX98905BFC |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | The MX98905 is designed for easy implementation of CSMA/CD local area networks, |
| 中文描述： | 該MX98905是專為易于實(shí)現(xiàn)的多址/光盤局域網(wǎng)， |
| 文件頁數(shù)： | 49/86頁 |
| 文件大?。?/td> | 352K |
| 代理商： | MX98905BFC |
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49
P/N: PM0365
REV. 1.3, NOV 20 ,1995
MX98905B
5. COMMAND REGISTER(CR) 00H (READ/WRITE)
The Command Register is used to take the controller on/
offline (STA and STP bits), initiate transmissions (TXP
bit), enable or disable Remote DMA operations (RD2,
RD1 and RD0 bits), and select register pages (PS1 and
PS0). To issue a command, the microprocessor sets the
corresponding bit(s). In addition, commands may be
overlapped following the guidelines below:
1. If a remote DMA operation overlaps a transmission,
RD0, RD1 and RD2 must be written with the desired
values, and a "0" or "1" may be written to the TXP bit,
because writing a "0" to TXP has no effect after
transmission is activated.
2. A remote write DMA may not overlap remote read
operation and vice versa. Each operation must either
be completed or aborted before starting the other one.
3. If a transmit command overlaps with a remote DMA
operation, bits RD2, RD1 and RD0 must be maintained
for the remote DMA command when setting the TXP
bit.
NOTE: If a remote DMA command is reissued while giving
the transmit command, the DMA will complete
the process immediately if the remote byte count
registers (RBCR1 and RBCR0) have not been
reinitialized, i.e., user has to program RBCR0
and/or RBCR1 every time he needs remote
DMA service.
4. Bits PS1, PS0, RD2 and STP can be set at any
moment.
STP
STA
TXP
RD0
RD1
RD2
PS0
PS1
0
1
2
3
4
5
6
7
Bits
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