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21-28391-02, 21285, 2128500-R

Table of contents:
Info of 21-28391-02
Info of 21285
Info of 2128500-R

21-28391-02, 21285, 2128500-R Selling Leads, Datasheet

MFG:HARR Package Cooled:PLCC D/C:99+

21-28391-02, 21285, 2128500-R Datasheet download

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Part Number: 21-28391-02

MFG: HARR

Package Cooled: PLCC

D/C: 99+

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21285 General Description

Intel Semiconductor's 21285 is a single-chip interface between an SA-110 microprocessor, synchronous DRAM memory (SDRAM), read-only memory (ROM), and the PCI bus. It is designed to support the following three modes of operation:
• PCI-based SA-110 computer. In this configuration, the SA-110 processor is the host Intelprocessor. It configures all PCI peripherals in the system.
• Attached processor. In this configuration, the SA-110 processor system interfaces directly to the host system PCI bus. The 21285 is configured by the host processor in the system.
• Intelligent add-in card. In this configuration, the SA-110 processor controls a PCI-based subsystem that is designed to be plugged into a host system PCI slot. Normally, a PCI-to-PCI bridge device interfaces the oncard PCI system to the host PCI system. The SA-110 processor typically configures the devices on the add-in card. Alternatively, these devices and the 21285 can be configured by the host processor in the system.

The SA-110 bus must be configured for enhanced mode (SA-110 signal CONFIG is high), address pipeline enabled (SA-110 signal APE tied high), and asynchronous bus clock (SA-110 signal SnA tied low). The SA-110 bus interface and PCI interface clocks are asynchronous to each other (all synchronization is done within the 21285). However, the SA-110 bus clock frequency must always be greater than or equal to the PCI bus clock frequency.

21285 Maximum Ratings

Parameter	Minimum	Maximum
Junction temperature,Tj	-	125
Supply Voltage, Vdd	-	3.9 V
Maximum voltage applied to signal pins	-	5.5 V
Maximum power PWC	-	1.77 W @ 33 MHz
Storage temperature range, Tstg	-55	125

21285 Features

• Flash ROM interface
• PCI Revision 2.1 compliant interface (32 bit, 33 MHz)
• DAC support (for Rev_ID 4 or higher)
• Enhanced parity support (for Rev_ID 4 or higher)
• Power Management Support (for Rev_ID 4 or higher)
• DMA controllers
• Interrupt controller
• Programmable timers
• Doorbell registers/mailboxes
• I2 O message unit
• X-Bus (8-bit parallel port)
• Serial port (UART)

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