assert. As with any register other than Interrupt Status (ISTAT), this register cannot be accessed except by a SCRIPTS instruction during SCRIPTS execution.

COM

LSI53C700 Family Compatibility

0

 

When this bit is cleared, the LSI53C810A behaves in a

 

 

manner compatible with the LSI53C700 family;

 

 

selection/reselection IDs are stored in both the SCSI

 

Selector ID (SSID) and SCSI First Byte Received (SFBR) registers.

When this bit is set, the ID is stored in the SCSI Selector ID (SSID) register, protecting the SCSI First Byte Received (SFBR) from being overwritten if a selection/reselection occurs during a DMA register-to-register operation.

This bit is not affected by a software reset.

Register: 0x3C–0x3F (0xBC–0xBF)

Adder Sum Output (ADDER)

Read Only

31

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ADDER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ADDER

 

 

Adder Sum Output

[31:0]

 

 

 

 

 

 

 

 

 

 

 

 

This register contains the output of the internal adder,

and is used primarily for test purposes. The power-up value for this register is indeterminate.

5-47

Page 121
Image 121
LSI 53C810A technical manual Register 0x3C-0x3F 0xBC-0xBF, Com, Adder Sum Output Adder Read Only, Adder Sum Output 310