Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 185)

Byte 02 - Buffer Full Ratio

The Buffer Full Ratio represents the amount of data that must be

present in the buffer during a buffered read operation before the CTS

will attempt to reconnect to the initiator. The value is expressed in

3-KByte increments. The default value for the Buffer Full Ratio is 80h

(384 KBytes). Valid values range from 20h to D0h (96 to 624 KBytes).

The Buffer Full Ratio must equal the Buffer Empty Ratio (see below).

If these values are not equal, the CTS returns Check Condition status

with the sense key set to Illegal Request (5h).

Note: If the ND bit is 1 and you set the Buffer Full Ratio to a value

less than A0h or greater than C0h, the value will automatically

be changed to A0h. If, however, you set the Buffer Full Ratio

to a value between A0h and C0h, that value will take effect. If

the ND bit is 0, the Buffer Full Ratio can have any value from

20h to D0h (96 to 624 KBytes).

Byte 03 - Buffer Empty Ratio

The Buffer Empty Ratio represents how empty the buffer must be

during a buffered write operation before the CTS will attempt to

reconnect to the initiator. The value is expressed in 3-KByte

increments. The default value for this byte is 80h (384 KBytes). Valid

values range from 20h to D0h (96 to 624 KBytes).

The Buffer Empty Ratio must equal the Buffer Full Ratio (see above).

If these values are not equal, the CTS returns Check Condition status

with the sense key set to Illegal Request (5h).

Note: The Buffer Full Ratio and the Buffer Empty Ratio in the

Disconnect-Reconnect Page are equivalent to the Reconnect

Threshold byte in the vendor-unique parameters for non-page

format. For more information about the reconnect threshold,

see Section 3.6.

Bytes 04 and 05 - Bus Inactivity Limit

The CTS does not recognize any values other than 0 for the Bus

Inactivity Limit. It uses 0 as a default value, meaning that there is no

limit to the amount of time that the CTS can assert a BSY signal

without a REQ/ACK handshake.

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

10-29

10 MODE SELECT (15h) andMODE SENSE (1Ah)

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Exabyte EXB-8205 Instruções de Operação Página 185