pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 342

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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6.0 Host-Controlled Modules and Host Interface
SuperI/O configuration section for the shared memory bridge. The number of address bits used for this decoding varies ac-
cording to the specified zones and their sizes. See “Memory Range Programing” on page 350 and “Shared Memory Config-
uration Register” on page 351 for details about the address range specifications.
6.1.5
The Interrupt Serializer translates internal IRQ sources into serial interrupt request data transmitted over the SERIRQ bus.
Figure 111 shows the interrupt serialization mechanism.
The internal IRQ signals are fed into an IRQ Mapping and Polarity Control block. This block maps them to their associated
IRQ slots. The IRQs are then fed into the Interrupt Serializer, where they are translated into serial data and transmitted over
the SERIRQ bus.
6.1.6
The PC87591x provides features to protect the Personal Computer (PC) at software levels. The PC can be locked to protect
configuration bits and to prevent alteration of the device hardware configuration and several types of configuration settings.
The use of all protection mechanisms is optional.
6.1.7
LPC Transactions Supported
The PC87591x LPC interface responds to the following LPC transactions as part of the standard Host Bus interface:
In addition, the Shared Memory module uses the following transactions:
LPC transactions conform with Intel’s LPC Interface Specification, Revision 1.0.
The LPC- FWH read and write protocols are similar to memory read and write cycles. The specifications of these cycles are
listed below. The Address, Data, TAR and SYNC cycles are as specified for LPC memory read and write cycles. The START
and ID fields are similar to the equivalent cycle in LPC memory read and write transactions but differ in the data placed on
the LAD signals (see details in the cycle description).
Note: The PC87591x supports FWH transactions from LPC controllers that accept wait-sync and long wait-sync cycles. With
other LPC controllers, use the indirect write mechanism in the Shared Memory module to perform write operations.
1. START: 1101
2. ID field: FWH ID nibble (compared with bits 7-4 of shared memory; see “Shared Memory Configuration Register” on
3. Address: Eight address nibbles, MS nibble first; see usage below).
4. TAR (two cycles).
5. SYNC.
6. DATA: Two data nibbles, LS nibble first (D3-D0, D7-D4).
7. TAR (two cycles).
FWH Read Cycle
— I/O read cycles
— I/O write cycles
— 8-bit memory read and write
— 8-bit FWH read and write
page 351).
Sources
Control
Signals
Internal
IRQ
Interrupt Serializer
Protection
LPC Interface
16
(0xD).
Enable and Polarity
IRQ Mapping,
Control
Figure 111. Interrupt Serialization Mechanism
IRQ15
IRQ1
342
(Continued)
LPC Interface
Serializer
Interrupt
SERIRQ
Revision 1.07