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| 型號： | MX98905B |
| 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是專為易于實現(xiàn)的多址/光盤局域網(wǎng)， |
| 文件頁數(shù)： | 69/86頁 |
| 文件大?。?/td> | 352K |
| 代理商： | MX98905B |
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69
P/N: PM0365
REV. 1.3, NOV 20 ,1995
MX98905B
16. DMA REGISTERS
(Continued)
LOCAL DMA RECEIVE REGISTERS
PAGE START/STOP REGISTERS (PSTART, PSTOP)
The Page Start and Stop Registers program the starting
and stopping page address of the Receive Buffer Ring.
Since the ENC uses fixed 256-byte buffers aligned on
page boundaries, only the upper eight bits of the start and
stop address are specified.
PSTART, PSTOP bit assignment.
PSTART,
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PSTOP
A15
A14
A13
A12
A11
A10
A9
A8
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
and the corresponding bit in ISR will be set.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BNRY
A15
A14
A13
A12
A11
A10
A9
A8
CURRENT PAGE REGISTER (CURR)
This register is used internally by the buffer management
logic as a backup register for reception. CURR contains
the address of the first buffer to be used for a packet
reception, and is used to restore DMA pointers if receive
errors occur. This register is initialized to the same value
as PSTART and should not be written to unless the
controller is reset.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CURR
A15
A14
A13
A12
A11
A10
A9
A8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MX98905B | IEEE 802.3, 10BASE5, 10BASE2 Controller and Integrated Bus Interface(IEEE 802.3, 10BASE5, 10BASE2控制器和集成總線接口) |
| MX98905BFC | The MX98905 is designed for easy implementation of CSMA/CD local area networks, |
| MXA2312A | Low Cost, +2,-2 g Dual Axis Accelerometer with Analog Outputs |
| MXA2500K | Ultra Low Cost, 【1.0 g Dual Axis Accelerometer with Absolute Outputs |
| MXA2500KV | Ultra Low Cost, 【1.0 g Dual Axis Accelerometer with Absolute Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MX98905BFC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:The MX98905 is designed for easy implementation of CSMA/CD local area networks, |
| MX98L715BEC | 制造商:MCNIX 制造商全稱:Macronix International 功能描述:3.3V SINGLE CHIP FAST ETHERNET NIC CONTROLLER |
| MX-9C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MX |
| MX-9G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MX |
| MX9G100B | 制造商:Panasonic Industrial Company 功能描述:90x90 gearhead for 40W motor,100:1 |
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