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**82370 Integrated System Peripheral (for 82376) c:Oct88
***Notes:...
***Info:
The 82370 is a multi-function support peripheral that integrates
system functions necessary in an 80376 environment. It has eight
channels of high performance 32-bit DMA (32-bit internal, 16-bit
external) with the most efficient transfer rates possible on the 80376
bus. System support peripherals integrated into the 82370 provide
Interrupt Control, Timers, Wait State generation, DRAM Refresh
Control, and System Reset logic.
The 82370's DMA Controller can transfer data between devices of
different data path widths using a single channel. Each DMA channel
operates independently in any of several modes; Each channel has a
temporary data storage register for handling non-aligned data without
the need for external alignment logic.
1.0 FUNCTIONAL OVERVIEW
The 82370 contains several independent functional modules. The
following is a brief discussion of the components and features of the
82370. Each module has a corresponding detailed section later in this
data sheet. Those sections should be referred to for design and
programming information.
1.1 82370 Architecture
The 82370 is comprised of several computer system functions that are
normally found in separate LSI and VLSI components. These include: a
high-performance, eight-channel, 32-bit Direct Memory Access
Controller; a 20-level Programmable Interrupt Controller which is a
superset of the 82C5SA; four 16-bit Programmable Interval Timers which
are functionally equivalent to the 82C54 timers; DRAM Refresh
Controller; a Programmable Wait State Generator; and system reset
logic. The interface to the 82370 is optimized for high-performance
operation with the 80376 microprocessor.
The 82370 operates directly on the 80376 bus. In the Slave Mode, it
monitors the state of the processor at all times and acts or idles
according to the commands of the host. It monitors the address
pipeline status and generates the programmed number of wait states for
the device being accessed. The 82370 also has logic to the reset of
the 80376 via hardware or software reset requests and processor
shutdown status.
After a system reset, the 82370 is in the Slave Mode. It appears to
the system as an I/O device. It becomes a bus master when it is
performing DMA transfers.
To maintain compatibility with existing software, the registers within
the 82370 are accessed as bytes. If the internal logic of the 82370
requires a delay before another access by the processor, wait states
are automatically inserted into the access cycle. This allows the
programmer to write initialization routines, etc. without regard to
hardware recovery times.
***Versions:...
***Features:...
**82371FB/SB PCI ISA IDE Xcelerator 82371FB/82371SB (PIIX/3) 01/31/95...
**82371MX Mobile PCI I/O IDE Xcelerator (MPIIX) 11/01/95...
**82371AB PCI-TO-ISA / IDE Xcelerator 82371AB (PIIX4) 02/17/97...
**82374/82375 PCI-EISA Bridge (82374EB/82375EB, 374SB/375SB) c:Mar93...
**82378 System I/O (SIO) (82378IB and 82378ZB) c:Mar93...
**82379AB System I/O-APIC (SIO.A) <Dec94...
**82380 32-bit DMA Controller w/ Integrated Peripherals 02/01/87...
**82380FB/AB PCIset: 82380FB Mobile PCI-to-PCI Bridge(MPCI2) 02/17/97...
**82384 Clock Generator and Reset Interface c86...
**82385 32-bit Cache Controller for 80386 09/29/87...
**82385SX 32-bit Cache Controller for 80386SX 01/25/89...
**82395DX High Performance Smart Cache 06/18/90...
**82395SX Smart Cache 12/17/90...
**82396SX Smart Cache 12/17/90...
**82485 Turbo Cache (and 485Turbocache) c90...
**82489DX Advanced Programmable Interrupt Controller 10/12/92...
**82495DX/490DX DX CPU-Cache Chip Set <Sep91...
**82495XP/490XP Cache Controller / Cache RAM (for i860) 06/05/91...
**82496/491 Cache Controller / Cache RAM (for P5 Pentium) 03/22/93...
**82497/492 Cache Controller / Cache RAM (for P54 Pentium) <Nov94...
**82498/493 Cache Controller / Cache RAM (for P54 Pentium) <Nov94...
**
**Later chipsets (basic spec):
**440 series:...
**450NX (?) 06/29/98:...
**????? (Profusion) c:99...
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*UMC...
**UM82C*** (IBM/INTEL Direct replacement) c87
Note: Dates vary for when these chips were first available. Two
databooks have been used one from '86 the other from '91. Not all the
chips are listed in the '86 databook, the date of '87 is an
assumption.
PC/XT:
IBM: UMC: Desc:
Intel 8284 UM82C84A 25MHz CMOS Clock Generator and Driver
Intel 8288 UM82C88 Bus Controller
Intel 8259 UM8259A Programmable Interrupt Controller also UM82C59A-2 (CMOS version)
Intel 8237 UM8237A 3-5MHz Programmable DMA Controller (DMAC)
Intel 8253 UM8253*2 2.6-5MHz Programmable Interval Timer
Intel 8255 UM82C55A* Programmable Peripheral Interface
Note: * indicates: possible compatibility, datasheet does not state
explicitly. YMMV.
Note: *2 indicates: The UM8253 can be replaced with the
UM82C54/-2. The datasheet says it is a superset of the 8253, and
works up to 10MHz. Also it's compatible with the 8254. AT: IBM:
UMC: Desc: Intel 82284 UM82C284* 10-12.5MHz Clock Generator and
Ready Interface Intel 82288 UM82C288* 10-12.5MHz Bus Controller
Intel 8254 UM82C54/-2 8-10MHz CMOS Programmable Interval Timer
Intel 8259 UM8259A Programmable Interrupt Controller also
UM82C59A-2 (CMOS version) Intel 8237 UM8237A 3-5MHz Programmable
DMA Controller (DMAC) 74LS612 UM74HCT612* Memory Mapper MC146818
RTC UM82C6818* Real-Time Clock (RTC) Intel 8047 ?? Keyboard
Controller
Note: * indicates: possible compatibility, datasheet does not state
explicitly. YMMV.
**UM82C088 PC/XT Integration Chip <91...
**UM82C230 286AT MORTAR Chip Set <91...
**UM82C210 386SX/286 AT Chip Set <91...
**UM82C3xx Twinstar & UM82C336F/N & UM82C39x [no datasheet] ?...
**UM82C380 386 HEAT PC/AT Chip Set <91...
**UM82C480 386/486 PC Chip Set c91
***Info:...
***Configurations:...
***Features:...
**UM82C493/491 ??????????????? [no datasheet] ?...
**UM8498/8496 486 VL Chipset "Super Energy Star Green"[no dsheet]c94...
**UM8881/8886 HB4 PCI Chipset "Super Energy Star Green"[no dsheet]c94...
**UM8890 Pentium chipset [no datasheet] ?...
**
**Support Chips:
**UM82152 Cache Controller (AUStek A38152 clone) <91...
**UM82C852 Multi I/O For XT <91...
**UM82C206 Integrated Peripheral Controller <91
***Info:...
***Versions:...
***Features:...
**UM82c45x Serial/Parallel chips ?...
**Other chips:...
*Unresearched:...
*VIA...
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*Winbond...
*ZyMOS...
*General Sources:...
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