GE IS200IVSHG1A distributed base station controller

Description

GE General Electric Technical Specifications: IS200IVSHG1A

A restriction for slave access to the IS200IVSHG1A controller register, when

the DMA is not enabled, is that they be accessed per SASI

protocol. That is, the COMMAND/STATUS register can

only be accessed when a command or status transfer is

required; the SELECT register may be accessed only when

the controller is to be selected; the DATA register may only

be accessed when data is to be transferred. If IS200IVSHG1A access to any

of these registers is attempted when the SASI interface is in

the wrong phase, the VME-SASI will not respond with a

DTACK*. Table 5 specifies the SASI signal conditions

required for legal access to the controller registers. Note

that for any slave access to be legal, the DMA must not be

enabled (DMAEN=O in CSR).

CSR register. Programming the interrupt level to 0 or 7

disables any interrupt requests IS200IVSHG1A from being generated.

Interrupt requests are issued for the following conditions:

1. a) After any DMA operation is completed. Completion of a

DMA is defined to be when the byte counter counts down to

zero or the controller has completed a command.

1. b) After a bus error occures during a DMA The

address where the error occurred remains in the DMA

address register.

Operating Modes

One of four operating modes IS200IVSHG1A can be selected for DMA

operations. The mode is selected by setting the MODE bits

of the CSR register to the binary value of the mode number

desired. The four modes are described below.

Mode 0

This mode allows data transfers with the controller actually

transferring the data to memory. Each data transfer from or

to the controller requires a handshake sequence to be

performed. When the DMA is enabled, handshakes are

performed until the byte counter goes to zero. Then an

interrupt request is issued, and the DMA is disabled.

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