參數(shù)資料
型號(hào): MDS212CG
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 網(wǎng)絡(luò)接口
英文描述: 12-Port 10/100Mbps Ethernet Switch
中文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA456
封裝: 35 X 35 MM, 2.33 MM HEIGHT, MS-034, HSBGA-456
文件頁(yè)數(shù): 74/111頁(yè)
文件大?。?/td> 1609K
代理商: MDS212CG
MDS212
Data Sheet
74
Zarlink Semiconductor Inc.
Bit [27:23]
Count
Count = Burst Size in double words Burst size for internal
memory is up to 8 D-words. Burst size for external memory is up
to 16 D-words
00001 = 1 D-word, ……01000 = 8 D-word
01111 = 15 D-word 10000 = 16 D-word
Valid value range for internal memory is {1 to 8}
Valid value range for external memory is {1 to 16}
Caution:
When setting Count = 16, the Starting address has to be in the Q-word boundary. That is MA[2]=0.
Bit [31:28]Reserved
18.2.3.4 Memory Read/Write Data Registers
Four 32-bit data registers share a common format
MWDR
Access:
Zero-Wait-State,
Address:
h790
MRDR
Access:
Zero-Wait-State,
Address: h794
Byte Order depends on CPU types
Little Endian CPUs
Memory Write Data Register
via FIFO,
Write only
Memory Read Data Register
Direct Access,
Read only
Big Endian CPUs
18.2.3.5 VTB - VLAN ID Table Base Pointer
Access:
Address:
Non-Zero-Wait-State,
h798
Direct Access,
Write/Read
Bit [5:0]
VIDB
VLAN ID Table Base, serves as [20:15]
bits of address. (VLAN ID Table is 32KB)
Bit [6]
Bit [8:7]
Reserved
VLMS
The size of VLAN MAC Table
00= reserved
01=16K (for 64 VLANs)
Default=11
10=32K (for 128 VLANs)
11=64K (for 256 VLANs)
31
24
23
16
15
8
7
0
Byte[3]
Byte[2]
Byte[1]
Byte[0]
31
24
23
16
15
8
7
0
Byte[0]
Byte[1]
Byte[2]
Byte[3]
31
17 16
15
11 10
9 8
7
6
5
0
VMACB
VLMS
VLAN ID BASE
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