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W89C926PENTIC

PCMCIA ETHERNET NETWORK TWISTED PAIR INTERFACE CONTROLLER

Winbond 

W89C926 PENTIC+

BIT

SYMBOL

DESCRIPTION

0

M/-IO

Share Memory/IO Mode Select

The PENTIC+ will operate in shared memory mode if this bit is high;

otherwise, it will be in I/O mode.

1-5

-

Reserved, must be 0s.

6

F/ EE

Flash or EEPROM Select.

This bit directly reflects the sampled value on pin EECS/FCS during a

H/W reset. This bit will be high or low if EECS/FCS is pulled high or low.

This bit is read-only.

7

LED

LED Disable.

Setting this bit high disables the LED indicators in order to save power.

CFB (Configuration Register B)

Access Address: AMBase + 00FF2H

Access Type: Attribute Memory Read/Write

BIT

SYMBOL

DESCRIPTION

0-1

PHY01 Physical Media Select

These two bits determine to which type of medium the PENTIC+ is

attached. The THIN pin will output low in 10BASE5 mode and high in

10BASE2 mode, according to PHY0,1. This can be used to control the

DC-DC converter for electrical isolation.

PHY1 PHY0 Attached Medium Type

0

0 TPI (10BASE-T Compatible Squelch Level)

0

1 Thin Ethernet (10BASE2)

1

0 Thick Ethernet (10BASE5)

1

1 TPI (Reduced Squelch Level)

The PENTIC+ also provides a UTP/BNC auto media-switching function.

The physical interface will jump from UTP to BNC when the PENTIC+ is

configured at UTP, the link checking is enabled, and the UTP path is

broken. It will jump back immediately if the UTP path has been

reconnected. When the physical interface is not configured at TPI or the

link checking is disabled, the auto media-switching function will be

disabled.

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