The Ethernet Port Initialization

Table 3-10. Master Mode Initialization (cont)

Register Bit

Value Comment

/,0￿￿'&2&￿￿7￿￿ ￿ )RU￿7￿￿RQO\￿±￿￿￿￿￿￿￿0+]￿UHIHUHQFH￿FORFN￿IRU￿WKH￿ '&2￿5￿FLUFXLWU\￿SURYLGHG￿RQ￿SLQ￿6<1&￿

Transmit Pulse Shape

For each type of Line Build-Out (LBO), the shape of the transmit pulse must be adjusted through QuadFALC registers LIM0, LIM2, XPM0, XPM1, and XPM2 in order to comply with FCC 68 or ANSI T1.403 (see Table 1-27 on page 31).

Line LED Control

For each T1/E1/J1 line, there is one green LED.

Each green LED is controlled through a QuadFALC pin (RPDi), allowing software or hardware control. Each of these RPDi pins can be configured for one of seven different functions. The selection is done in QuadFALC register PC4 (one for each pin). This gives the ability to control the LED in different operations:

When PC4 = 0x00, the green LED is OFF

When PC4 = 0x30, the green LED is ON

When PC4 = 0x70, the green LED is ON if synchronized to Rx line, OFF otherwise.

The Ethernet Port Initialization

The Ethernet Line Interface Unit (LIU) is a INTEL LXT971A.

The LIU is connected to FCC3 through a Media Independent Interface (MII).

See Boot Firmware: sys\h\4538.h.

The LIU internal registers are initialized through MDC and MDIO Management pins. These pins have to be manually manipulated through PC(25) and PC(26) pins. The LIU PHY address is set to 0 (address pins are cabled to 0V).

See Boot Firmware: eth\c\lxtinit.c.

The TTY Framer Initialization

The TTY port is connected to an SMC1 framer that is used in UART mode. For SMC1 operation, MPC8260 port D pins 8 and 9 have to be configured properly.

See Boot Firmware: sys\h\4538.h.

SMC1 baud-rate generator is BRG7 - see BRG7 – TTY Baud-Rate Generator on page 73.

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Interphase Corporation