Tandberg Data
Mode Select
14-13
Tandberg SLR Product Line SCSI Functional Specifications
14.3.4. Disconnect/Reconnect Page
This page is used to specify the Drive's disconnect and
reconnect parameters.
The page can be saved.
BYTE
BIT 7
6
5
4
3
2
1
0
00
PS
R
Page Code = 02h
01
Page Length = 0Eh
02
Read Buffer Full Ratio
03
Write Buffer Empty Ratio
04
Bus Inactivity Time
05
06
Disconnect Time Limit
07
08
Connect Time Limit
09
10
Maximum Burst Size
11
12
EMDP
FARd
FAWrt
FAStat
DImm
DTDC
13
RESERVED
14
First Burst Size
15
Table 14-15: Disconnect/Reconnect Page Descriptor
PS
The Parameter Savable (PS) bit must be set to zero.
Page Code
The Page Code for this page must be set to 02h.
Page Length
The Page Length field must always be set to 0Eh.
Read Buffer Full
Ratio
The read buffer full ratio indicates to the Drive, on
READ commands, how full the buffer will be prior to
reconnecting. The read buffer full ratio is a number in
the range 0..255. A value of 0 indicates that only one
block ready in the buffer is enough to force a
reconnect. A value of 255 indicates that the buffer must
be almost 100 % full 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
for Rbfr equal to 0
Nb = (Rbfr * 16 KBytes)
for Rbfr
not
equal to 0
(Where Nb = Number of bytes and Rbfr = Read Buffer Full
Ratio)
If the specified Read Buffer Full 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.
Ö
Legal values are numbers in the range 0..255.
