Tandberg Data SLR7-140 PROGRAMMER Manual page 232

Write Buffer Empty
Ratio
Bus Inactivity Time
Limit
Disconnect Time
Limit
Connect Time Limit
Maximum Burst
Size
EMDP
FARd
FAWrt
FASTat
Tandberg Data
The default (factory programmed) value is 16 (i.e.
256 KBytes).
The write buffer empty ratio indicates to the Drive, on
VERIFY and WRITE commands, how empty the buffer will be
prior to reconnecting to fetch more data. The write
buffer empty ratio is a number in the range 0..255. A
value of 0 indicates that if there is room for just one
block in the buffer then the Drive will reconnect. A
value of 255 indicates that the buffer must be almost
100 % empty before a reconnect occurs (assuming a 4
MByte data buffer). This field is changeable.
The actual amount of data (in number of bytes) needed
for a reconnect can be calculated using the following
formula:
Nb = 512
Nb = (Wber * 16 KBytes)
(Where Nb = Number of bytes and Wber = Write Buffer
Empty Ratio)
If the specified Write Buffer Empty Ratio corresponds to
an amount of data that is larger than the installed data
buffer size, the drive will round the Read Buffer Full
Ratio down to a value corresponding to the actual buffer
size.
Legal values are numbers in the range 0..255.
The default (factory programmed) value is 16 (i.e.
256 KBytes).
This field must be set to 0, it is not changeable (there
is no limit for how long the Drive is permitted to
assert the BSY signal without a REQ/ACK handshake).
This field must be set to 0, it is not changeable (there
is no disconnect time limit).
This field must be set to 0, it is not changeable (there
is no limit for how long the Drive is allowed to use the
SCSI-bus before it disconnects).
This field indicates the maximum amount of data in 512
byte increments that the Drive can transfer on the SCSI-
bus before disconnecting. A value of zero indicates that
there is no limit.
Legal values are numbers in the range 0..65536.
The default (factory programmed) value is 0.
The Enable Modify Data Pointer (EMDP) bit must be set to
0, it is not changeable (the Drive does not support re-
ordering of data transfers).
The Fair Arbitration Read (FARd) bit must be set to 0,
it is not changeable (the Drive only supports priority
arbitration).
The Fair Arbitration Write (FAWrt) bit must be set to 0,
it is not changeable (the Drive only supports priority
arbitration).
The Fair Arbitration Status (FAStat) bit must be set to
0, it is not changeable (the Drive only supports
priority arbitration).
14-14 Tandberg SLR Product Line SCSI Functional Specifications
for Wber equal to 0
for Wber not equal to 0
Mode Select