MTD505 Datasheet, PDF (12/19 Pages) List of Unclassifed Manufacturers – 5 Port 10M/100M Ethernet Switch

MYSON
TECHNOLOGY
MTD505
(Preliminary)
3.11 Port Trunking
The port trunking function can also be implemented by VLAN registers. One trunk port isolates the
packet transmitting and receiving from the other trunk ports, which performs a logical trunk topology.
The non-trunk port should choose only one trunk port for transmitting, which can achieve the load bal-
ancing and maintain the packet sequences.
3.12 Memory Interface
Two kinds of external memory interface can be selected by user -- 1M byte memory (256K32 x 1) and 2
M bytes (256K32 x 2 or 512K32 x 1). Maximum 2M byte external memory can be used for packet buff-
ering. “-10 “ speed grade of SGRAM/SDRAM device is recommanded. The following table is the
SGRAM application pin connection :
Memory Type
Memory
Chip No
A[8]
CS0B
CS1B
256K32 x 1
A8
CS0B
NC
256K32 x 2
A8
CS0B
CS1B
512K32 x 1
A9
CS0B
A8
3.13 Internal MII Registers Acess and Control
The MTD505 support 2 serial pins (SDIO/SDC) for internal registers acess and control; The detailed
registers informations are presented in Section4.0 (Internal MII Registers).
3.14 LED Display
The MTD505 use 10 pins to output 2 kinds of LED display -- LEDDATA[7:0], LEDCLK1, LEDCLK2.
Using LEDCLK1 rising edge, LEDDATA[7:0] report Port7~0 link/receive activity led status. Using
LEDCLK2 rising edge, LEDDATA[4:0] report packet buffer utilization rating, and LEDDATA[7] report
external memory test result(after power reset, MTD505 will test external SDRAM automatically), LED-
DATA[6] report the buffer almost full alarm signal .
4.0 Internal MII Registers
The MTD505 implements 10 MII global registers and 4 per port registers, define as following tables:
TABLE 1. MII r egister s
GLOBAL REGISTERS
REG
NO
Bits
0
Name
CtlReg0
R/W
Descriptions
R/W
CONTROL REGISTER 0
bit[0] = 1 --> switch to port 0 registers
Default
bit[1] = 1 --> switch to port 1 registers
bit[2] = 1 --> switch to port 2 registers
bit[3] = 1 --> switch to port 3 registers
8-0
bit[4] = 1 --> switch to port 4 registers
9’h100
bit[5] = reserved
bit[6] = reserved
bit[7] = reserved
bit[8] = 1 --> switch to global registers
12-9
scan mode select 3-0
15-13
Scan port select
1
CtlReg1 R/W
CONTROL REGISTER 1
16’h3084
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MTD505 Revision 1.2 14/04/2000