參數(shù)資料
型號: LAN91C96I
廠商: SMSC Corporation
英文描述: NON-PCI SINGLE-CHIP FULL DUPLES ETHERNET CONTROLLER
中文描述: 非PCI單芯片以太網(wǎng)控制器全DUPLES
文件頁數(shù): 47/110頁
文件大?。?/td> 655K
代理商: LAN91C96I
Non-PCI Single-Chip Full Duplex Ethernet Controller
SMSC DS – LAN91C96I
Page 47
Rev.
11/18/2004
DATASHEET
I/O SPACE - BANK2
OFFSET
NAME
TYPE
SYMBOL
0
MMU COMMAND REGISTER
WRITE ONLY
BUSY BIT
READABLE
MMUCR
This register is used by the CPU to control the memory allocation, de-allocation, TX FIFO and RX FIFO
control. The three command bits determine the command issued as described below:
COMMAND
0
N2
N1
N0/
BUSY
0
w
x
y
z
COMMAND SET:
wxyz
0000
0) -
NOOP - NO OPERATION -
0010
2) -
ALLOCATE MEMORY FOR TX - N2, N1, N0 defines the amount of memory requested
as (value + 1) 256* bytes. Namely N2, N1, N0 = 1
Valid range for N2, N1, N0 is 0 through 5. A shift-based divide by 256 of the packet
length yields the appropriate value to be used as N2, N1 and N0. Immediately generates
a completion code at the ALLOCATION RESULT REGISTER. Can optionally generate
an interrupt on successful completion. The allocation time can take worst case (N2, N1,
N0 + 2)* 200μs.
will request 2 256* = 512 bytes.
0100
4) -
RESET MMU TO INITIAL STATE - Frees all memory allocations, clears relevant
interrupts, resets packet FIFO pointers.
0110
6) -
REMOVE FRAME FROM TOP OF RX FIFO - To be issued after CPU has completed
processing of present receive frame. This command removes the receive packet number
from the RX FIFO and brings the next receive frame (if any) to the RX area (output of
RX FIFO).
0111
7) -
REMOVE FRAME FROM TOP OF TX FIFO- To be issued ONLY after the Host disabled
the transmitter and has completed processing of the present transmit frame.
Note
:
Determining Transmit completion is done by polling the TEMPTY bit in the Transmit FIFO Port Register.
This command removes the Transmit packet number from the TX FIFO and brings the next Transmit
frame (if any) to the TX area (output of TX FIFO).
1000
8) -
REMOVE AND RELEASE TOP OF RX FIFO - Like 6) but also releases all memory used
by the packet presently at the RX FIFO output.
1010
A) -
RELEASE SPECIFIC PACKET - Frees all pages allocated to the packet specified in the
PACKET NUMBER REGISTER. Should not be used for frames pending transmission.
Typically used to remove transmitted frames, after reading their completion status. Can
be used following 6 (to release receive packet memory in a more flexible way than 8).
1100
C) - ENQUEUE PACKET NUMBER INTO TX FIFO - This is the normal method of
transmitting a packet just loaded into RAM. The packet number to be enqueued is taken
from the PACKET NUMBER REGISTER.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LAN91C96I_07 制造商:SMSC 制造商全稱:SMSC 功能描述:Non-PCI Single-Chip Full Duplex Ethernet Controller
LAN91C96IMS 制造商:Microchip Technology Inc 功能描述:
LAN91C96I-MS 功能描述:以太網(wǎng) IC Non-PCI 10 Mbps Ethernet MAC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
LAN91C96I-MU 功能描述:以太網(wǎng) IC Non-PCI 10 Mbps Ethernet MAC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
LAN91C96IQFP 功能描述:以太網(wǎng) IC Non-PCI 10 Mbps Ethernet MAC RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray