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IMS M212 disk processor

September 1987
INMOS document number: 72-TRN-103-02
126 Pages

© INMOS Limited 1988. INMOS reserves the right to make changes in specifications at any time and without notice. The information furnished by INMOS in this publication is believed to be accurate; however, no responsibility is assumed for its use, nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted under any patents, trademarks or other rights of INMOS.


floppy disk

The IMS M212 is the first device in a range of intelligent peripherals in the transputer family. The device contains hardware and interface logic to control disk drives as well as a 16-bit processor with on-chip memory and communication capability, and is consistent with the INMOS transputer architecture described in the transputer architecture manual.

This manual details the product specific aspects of the IMS M212 and contains data relevant to the engineering and programming of the device.

Other information relevant to transputer products is contained in the occam programing manual (supplied with INMOS software products and available as a separate publication), and the transputer development system manual (supplied with the development system).

The examples given in this manual are outline design studies and are included to illustrate various ways in which transputers can be used. The examples are not intended to provide accurate application designs.

The following sections assume a familiarity with the arrangement and operation of disk drives and disk drive control and an appendix (A) has been provided for the reader requiring a brief overview of these topics.

This edition of the manual is dated September 4, 1987.



1	The IMS M212 Disk processor

2	Mode 1 operation

	2.1	Overview
	2.2	Mode 1 programming interface
	2.3	Parameters
	2.4	Commands
		2.4.1	EndOfSequence
		2.4.2	Initialise
		2.4.3	ReadParameter
		2.4.4	WriteParameter
		2.4.5	ReadBuffer
		2.4.6	WriteBuffer
		2.4.7	ReadSector
		2.4.8	WriteSector
		2.4.9	Restore
		2.4.10	Seek
		2.4.11	SelectHead
		2.4.12	SelectDrive
		2.4.13	PollDrives
		2.4.14	FormatTrack
		2.4.15	Boot
	2.5	Errors and reasons
	2.6	Addressing and auto-increment modes
	2.7	Retries
	2.8	Auto-booting
	2.9	Formats available in mode 1
	2.10	ECC, CRC and polynomials
	2.11	Initialise defaults
	2.12	Hardware requirements
	2.13	Disk controller access
	2.14	Sample declarations and code sequences
	2.15	Getting started

3	Mode 2 operation

	3.1	Overview
	3.2	Control code format
		3.2.1	Read register
		3.2.2	Write register
		3.2.3	Command code (zero data)
		3.2.4	Command code (single data)
		3.2.5	Repeat data code
		3.2.6	Multiple data code
	3.3	Bus interface logic
	3.4	PIA ports
	3.5	Read/Write control
		3.5.1	Read/write timing and control registers
		3.5.2	Operation code description
	3.6	Serial/parallel conversion
	3.7	Parallel/serial conversion
	3.8	CRC/ECC generator
	3.9	ID/DATA field comparison
	3.10	Data separation
	3.11	Precompensation
	3.12	Timeout logic

4	IMS M212 processor

	4.1	IMS M212 types
	4.2	IMS M212 process multiplexing
	4.3	IMS M212 Error flag
	4.4	IMS M212 memory map
	4.5	IMS M212 timer
	4.6	IMS M212 event pins
	4.7	IMS M212 link placement

5	System services and processor signals

	5.1	Reset
	5.2	Analyse
	5.3	Bootstrapping and analysis of a "failed" system
		5.3.1	Bootstrapping
		5.3.2	Bootstrapping from ROM
		5.3.3	Bootstrapping from a link
		5.3.4	Peeking and Poking
	5.4	Using Error and Analyse

6	Communications

	6.1	Standard transputer links
		6.1.1	Link speed selection

7	Memory interface

8	Peripheral interfacing

	8.1 Event process

9	Typical configurations

10	Performance

	10.1	Performance overview
		10.1.1	Fast multiply, TIMES
		10.1.2	IMS M212 arithmetic
		10.1.3	Floating point operations
		10.1.4	Effect of external memory
	10.2	IMS M212 speed selections

11	Physical Parameters

	11.1	Absolute maximum ratings
	11.2	Recommended operating conditions
	11.3	DC characteristics
	11.4	Measurement of AC characteristics
	11.5	Connection of INMOS serial links
	11.6	AC characteristics of system services
	11.7	Memory interface AC characteristics
	11.8	Peripheral interfacing AC characteristics
	11.9	Disk Interface Parameters

12	IMS M212 signal summary

	12.1	Signal list

13	Package

	13.1	J-Lead chip carrier
	13.2	Pin Grid Array
	13.3	Package Dimensions


A	Disk drive overview

B	Disk controller registers

C	Correction algorithms for ECC's

	C.1	Normal correction
	C.2	Reverse correction
	C.3	Chinese correction

D	Data separation phase locked loop

	D.1	Basic Equations
	D.2	Typical Winchester Example
	D.3	Typical Floppy Example

E	Precompensation phase locked loop

	E.1	Basic Equations
	E.2	Typical Example

F	Mode 1 quick reference

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Last modification: 9/12/2014 6:42:13 PM