Motorola MVME2700 Series Manuel d'utilisateur télécharger pdf (Page 374)

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5-42 Computer Group Literature Center Web Site

System Calls

.NETFRD

Name

.NETFRD - Retrieve specified file blocks

Code

$001C

Description

This routine allows you to retrieve the specified file blocks. You would use

this routine multiple times to retrieve the entire file. Prior to using this

routine a .NETFOPN system call must have been performed. For each file

block retrieved the firmware will transmit a TFTP ACK packet to

acknowledge the receipt of data. The end of data will be signified when the

number of bytes transferred is smaller than the block size. The block size

is set at 512 bytes (TFTP convention). For each .NETFRD system call

performed, you must update (increment by one) the block number field of

the command packet. Initially the block number is one.

Information about the file block is passed in a command packet which has

been built in memory. (The user program must first manually prepare the

packet.) The address of the packet is passed as an argument to the routine.

All packets must be word-aligned. The format of the packet structure,

NFILEREAD, is shown below:

FEDCBA9876543210

$00 Controller LUN Device LUN

$02 Status Word

$04

Data Transfer Address

Most Significant Word

$06 Least Significant Word

$08 Transfer Byte Count

$0A Block Number

$0C

Data Packet (File Block) Timeout

Most Significant Word

$0E Least Significant Word

1 2 ... 369 370 371 372 373 374 375 376 377 378 379 ... 507 508

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Motorola MVME2700 Series Manuel d'utilisateur Page 374

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