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W83759A Datasheet Preview

W83759A Datasheet

ADVANCED VL-IDE DISK CONTROLLER

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W83759A
ADVANCED VL-IDE DISK CONTROLLER
GENERAL DESCRIPTION
The W83759A is an advanced version of Winbond's popular VL-IDE interface chip, the W83759. The
W83759A retains all of the features and compatibility of the W83759 (the chip meets the ANSI ATA
4.0 specification for IDE hard disk operation and the VESA VL-Bus 2.0 specification for PC local bus
devices) while incorporating new features to meet Enhanced IDE, SFF-8011, ATA-2, and Fast-ATA
specifications.
Supports Disk Capacity of Greater than 528 MB
The W83759A's driver can handle remapping from BIOS CHS mode to HDD LBA mode. This scheme
enables users to break the 528 MB per drive barrier, allowing full use of BIOS INT13 CHS information
in drives with a capacity of up to 8.4 GB.
High Speed Host Transfer Rate
The W83759A supports Enhanced IDE PIO mode 3 and Fast ATA PIO mode 3 and 4 timing; jumper
settings or driver programming can be used to select the PIO mode and a 33 or 50 MHz VL-Bus
clock. Different programming timing can be selected for different drives in the same system. The
burst transfer rate is shown in the following table.
ATA PIO
MODE
0
1
2
3
4
IDE COMMAND CYCLE
TIME (nS)
600
383
240
180
120
BURST TRANSFER
RATE (MB/sec)
3.33
5.22
8.33
11.1
16.6
IORDY THROTTLE
CONTROL
Option
Option
Option
Required
Required
Dual IDE Channels
Like the W83759, the W83759A supports a secondary IDE address (170h-177h/376h) and IRQ15 for
applications with four hard disk drives. Additionally, the primary and secondary channels can be
independently enabled or disabled by jumper settings or software programming.
Non-disk IDE Peripherals
Because the command cycle can be programmed individually for each drive and dual IDE channels
are supported, non-disk IDE peripherals (such as an ATAPI CD-ROM or tape drive) can be attached
to the secondary IDE without affecting the transfer rate of the ATA disk drive. Sales of ATAPI IDE
CD-ROMs are expected to grow rapidly as these devices become a standard part of many users'
desktop PC setup.
Publication Release Date: May 1995
- 1 - Revision A1




Winbond

W83759A Datasheet Preview

W83759A Datasheet

ADVANCED VL-IDE DISK CONTROLLER

No Preview Available !

W83759A
Enhanced IDE/Fast ATA Dual Channel Structure
Primary Channel
40-pins
Secondary Channel
40-pins
Disk
< 8.4 GB
PD0
Disk
< 8.4 GB
PD1
CD ROM
ATAPI
SD0
Tape
ATAPI
SD1
The W83759A provides all of the next-generation ATA-IDE requirements, including support for high
capacity disk drives, high speed host transfers, multiple IDE peripherals, and non-disk IDE
peripherals. It makes high-performance, low-cost, easy-to-use IDE machines possible.
The W83759A is pin-to-pin backward compatible with the W83759. In addition to the advanced
features described above, the W83759A supports automatic power-down, standby, and suspend APM
power management states for green PC applications. This new chip is packaged in a 100-pin QFP.
The table below compares the W83759 and W83759A:
Dual Channel IDE
8.4 G Max. Cap.
PIO Mode 3, 4 Control
DMA Mode Control
IOCHRDY Control
IDE Timing Control
Prefetch Control
Power Saving Control
ATAPI Protocol
W83759
Yes
Software Driving
No
No
No
Jumper
No
No
Software Driving
* All control is drive-by-drive (per drive selectability)
W83759A
Yes
Software Driving
Yes*
Yes*
Yes*
Jumper or Driver*
Yes*
Yes*
Software Driving
-2-


Part Number W83759A
Description ADVANCED VL-IDE DISK CONTROLLER
Maker Winbond
Total Page 30 Pages
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