SMC Networks 486DX4 - Manual (Page 34)

AR-B1462 User¡ ¦s Guide
3-16
3.2.16 Memory Setting
(1) DRAM Configuration
There are two 32-bit memory banks on the AR-B1462 board. It can be one-side or double-side SIMM (Single-Line
Memory Modules) which is designed to accommodate 256KX36 bit to 16MX36-bit SIMMs. This provides the user
with up to 128MB of main memory. The 32-bit SIMM (without parity bit) also can be used on AR-B1462 board.
There are listing on-board memory configurations available. Please refer to the following table for details:
SIMM1 SIMM2 Total Memory
256KX32(X36) None 1MB
256KX32(X36) 256KX32(X36) 2MB
512KX32(X36) None 2MB
512KX32(X36) 512KX32(X36) 4MB
1MX32(X36) None 4MB
1MX32(X36) 1MX32(X36) 8MB
2MX32(X36) None 8MB
2MX32(X36) 2MX32(X36) 16MB
4MX32(X36) None 16MB
4MX32(X36) 4MX32(X36) 32MB
8MX32(X36) None 32MB
8MX32(X36) 8MX32(X36) 64MB
16MX32(X36) None 64MB
16MX32(X36) 16MX32(X36) 128MB
Table 3-9 DRAMs’ Configuration
(2) Cache RAM Select (JP10)
The AR-B1462 can be configured to provide a write-back or write-through cache scheme and support 512KB
cache systems. A write-back cache system may provide better performance than a write-through cache system.
The BIOS Setup program allows you to set the cache scheme either write-back or write-through, either the internal
cache selection.
1
2
JP10
Write-Through
1
2
Write-Back
Factory Default Setting
Figure 3-36 JP10: Write-Through/Write-Back CPU Select
3.3 ETHERNET CONTROLLER
The Ethernet controller of the AR-B1462 is a highly integrated design that provides all Media Access Control
(MAC) and Encode-Decode (ENDEC) functions in accordance with the IEEE 802.3 standard. Network interfaces
include 10BASE5 or 10BASE2 Ethernet via 10BASE-T via the Twisted-pair. The Ethernet controller can interface
directly to the PC-AT ISA bus without any external device. The interface to PC-AT ISA bus is fully compatible with
NE2000 Ethernet adapter cards, so all software programs designed for NE2000 can run on the Ethernet controller
card without any modification.
Microsoft’ s Plug and Play and the jumperless software configuration function are both supported. The capability of
the PnP and Non-PnP mode autoswitch function allows users to configure network card. No jumpers or switches
are needed to set when using either the PC or PnP function. The integrated 8KX16 SRAM and 10BASE-T
transceiver make Ethernet controller more cost-effective.