mds108 Zarlink Semiconductor, mds108 Datasheet - Page 30

• Manufacturer Part Number: mds108
• Description: Unmanaged 9-port 10/100 Mbps Ethernet Switch
• Manufacturer: Zarlink Semiconductor

13.2
The Strap options are relevant during the initial power-on period, when reset is asserted. During reset, the MDS108
will examine the boot strap address pin to determine its value and modify the internal configuration of the chip
accordingly.
Note 1:
Note 2:
Boot Strap Pins
206 (L_A[5])
208 (L_A [6])
5, 4 (L_A [10:9])
151 (L_A[17])
150 (L_A[2])
204 (L_A[3])
205 (L_A[4])
2 (L_A[8])
133 (TST[2])
Pin No(s).
Strap Options
"1" mean Pull-up
"0" means Pull-down with an external 1 K Ohm.
Default value is 1, (all boot strap pins have internal pull up resistor).
If the MDS108AL is configured from EEPROM preset (L_A[6] pulled down at reset), it will try to load its configuration from the
EEPROM. If the EEPROM is blank or not preset, it will not boot up. The parallel port can be used to program the EEPROM at
any time.
During normal power-up, the MDS108 will run through an external SBRAM memory test to ensure that there are no memory
interface problems. If a problem is detected, the chip will stop functioning. To facilitate board debug in the event that a system
stops functioning, the MDS108AL can be put into a continuous SBRAM self test mode to allow an operator to determine if
there are stuck pins in the memory interface (using network analyzer).
SBRAM Self Test
SPD100 Polarity
Port 8 MII/Serial
XLINK Speed
Memory Size
FDX Polarity
Link Polarity
EEPROM
Device ID
Symbol
1 - Memory size = 256 KB
0 - Memory size = 512 KB
1 - NO EEPROM Installed
0 - EEPROM Installed
11 - 100 Mbps
10 - 200 Mbps
01 - 300 Mbps
00 - 400 Mbps (0 - Pull down, 1 - Pull up)
1 - MII Mode for port 8
0 - Serial Mode for port 8
Link Polarity for serial interface
1 - Active Low
0 - Active High
Full/Half Duplex Polarity for serial interface
1 - Active Low
0 - Active High
Speed polarity for serial interface
1 - Active Low
0 - Active High
Use in cascade mode only
For Board/System Manufacturing Test
1 - Disable
0 - Enable
Zarlink Semiconductor Inc.
MDS108
30
Name & Functions
1
2
Data Sheet