Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 178)

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101

Byte 00, Bit 5 - ND (No Disconnect During Data Transfer)

This bit is used to enable the CTS to disconnect from the initiator

during the data transfer phase, as follows:

0 – The CTS can disconnect during the data transfer phase. (Power-on

default)

1 – The CTS will not disconnect during the data transfer phase.

Restrictions when the ND bit is 1:

During a write operation, the data transfer from the initiator

does not start until the number of bytes of available space in

the CTS’s buffer is greater than or equal to the total transfer

length specified by the CDB.

During a read operation, the data transfer to the initiator does

not start until all of the data requested by the CDB is resident

in the CTS’s buffer.

If the Reconnect Threshold byte is set to a value less than A0h

or greater than C0h, it will be changed to A0h. This is

necessary for proper buffer management.

Byte 00, Bit 3 - NBE (No Busy Enable)

This bit is included for EXB-8200 compatibility only. This bit is set to 1

in the MODE SENSE data and is ignored by the CTS in the MODE

SELECT command.

Byte 00, Bit 2 - EBD (Even Byte Disconnect)

This bit is used to enable disconnects on even-byte boundaries, as

follows:

0 – Disconnect on any byte.

1 – Disconnect on even-byte (two-byte or four-byte) boundaries.

Note: An EEPROM option allows you to control what happens

when the EBD bit is set to 1. Depending on CTS’s EEPROM

image, setting the EBD bit to 1 allows disconnects to occur on

two-byte boundaries or on four-byte boundaries (see the

“EBD unit size” option on page A-23).

10-22

EXB-8205 and EXB-8505

(Standard and XL)

510503

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

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