Seagate Fibre Channel Interface - Manual (Page 235)

Fibre Channel Interface Manual, Rev. D 221
12.13.3 Disconnect/Reconnect Control page (02h)
The Disconnect/Reconnect Control page implementation is defined in Table 148. This table summarizes the
function and defines the default values.
See individual drive’s Product Manual, Volume 1, section showing changeable values. A value of zero (0)
means this bit function is not directly changeable by an initiator; a value of 1 means the bit function is directly
changeable by an initiator (see Mode Select command).
Field definitions (listed alphabetically)
Buffer Empty Ratio
This number is the numerator of a fractional multiplier that has 256 (100h) as its denominator. This field indicates, on Write
commands, how empty the disc drive’s buffer will be before attempting to arbitrate from control of the loop. The disc drive,
rounds the requested ratio down to the nearest whole logical block. This value is changeable by an initiator.
Buffer Full Ratio
This number is the numerator of a fractional multiplier that has 256 (100h) as its denominator. This field indicates, on Read
commands, how full the disc drive’s buffer will be before attempting to arbitrate for control of the loop. The disc drive rounds
the requested ratio up to the nearest whole logical block. This value is changeable by an initiator.
Table 148: Disconnect/Reconnect Control page (02h)
Bit
Byte
7 6 5 4 3 2 1 0
Page descriptor header
0 1 0 0 0 0 0 1 0
PS Page Code (02h)
1
Page Length (0Eh)
Disconnect/reconnect control parameters
2
Default
Buffer Full Ratio
3
Default
Buffer Empty Ratio
4
Default
Bus Inactivity Limit (MSB)
5
Default
Bus Inactivity Limit (LSB)
6,7
Default
Disconnect Time Limit
8,9
Default
Connect Time Limit
10,11
Default
MSB
Maximum Burst Size
LSB
12
Default
EMDP
0 0 0
DImm DTDC
13–15
Reserved
Table
number
148
148