82801E datasheet(46/84 Pages) INTEL

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Intel® 82801E C-ICH

Advance Information Datasheet

3.2.17

SIU LPC Interface

SIU0_RI#

SIU1_RI#

Ring Indicator for UART0 and UART1: Active low, this pin indicates that a

telephone ringing signal has been received by the external agent.

NOTE: These pins are Modem Status Input whose condition can be tested by

the processor by reading bit 6 (RI) of the Modem Status register (MSR).

Bit 6 is the complement of the RI# signal. Bit 2 (TERI) of the MSR

indicates whether the DCD# input has changed state since the previous

reading of the MSR. When the RI bit of the MSR changes state an

interrupt is generated if the Modem Status Interrupt is enabled.

SIU0_RTS#

SIU1_RTS#

Request to Send for UART0 and UART1: When low these pins informs the

modem or data set that 82801E C-ICH UART0 and UART1 are ready to establish

a communication link. The RTS#x(x=0,1) output signals can be set to an active

low by programming the RTSx (x-0,1) (bit1) of the Modem control register to a

logic ‘1’. A Reset operation sets this signal to its inactive state (logic ‘1’). LOOP

mode operation holds this signal in its inactive state.

SIU0_RXD

SIU1_RXD

Serial Inputs for UART0 and UART1: Serial data input from device pin to the

receive port.

SIU0_TXD

SIU1_TXD

Serial Output for UART0 and UART1: Serial data output to the communication

peripheral/modem or data set. Upon reset, the TXD pins will be set to MARKING

condition (logic ‘1’ state).

Table 23. SIU Interface

Signal Name

Type

Description

SIU_LAD[3:0]

I/O

SIU LPC Multiplexed Command, Address, Data: Internal pull-ups are provided.

SIU_LCLK

SIU LPC clock input to SIU: 33 MHz LPC clock.

SIU_LDRQ#

SIU LPC Serial DMA/Master Request Output: Used by SIU devices to indicate a

DMA request.

NOTE: These signals have weak internal pull-up resistors to avoid external glue.

SIU_LFRAME#

SIU LPC Frame: Indicates the start of an LPC cycle, or an abort.

SIU_RESET#

SIU RESET: This signal should be tied to PCI RESET.

SIU_SERIRQ

I/O

SIU Serial IRQ input: This pin receives the serial interrupt protocol from external

devices. Pull up if unused.

Table 22. Universal Asynchronous Receive And Transmit (UART 0, 1) (Sheet 2 of 2)

Signal Name

Type

Description

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