1747-6.22, Backup Scanner User Manual

M0 File BT Control Buffer Layout
BT Control Flag Definitions
M1 File - Block Transfer Input/Status Buffers
RIO Block Transfer 7-111
Important: The buffer layout below is the same for all 32 BT
buffers. Buffer 1 = M0:e.100... buffer 32 = M0:e.3200.
BT Control Buffer Function
M0 Address where x = buffer # from 1 to
32
Control Flags - See Control Flag
Definitions table below
M0:e.x00
BT Length - 0 through 64 M0:e.x01
BT Address (logical rack, group, and slot) M0:e.x02
Reserved M0:e.x03 through M0:e. x09
BTW Data Locations 0 through 63 M0:e.x10 through M0:e.x73
Definition
Control flags where x = buffer # from 1 to
32
These bits are reserved. M0:e.x00/0 through M0:e.x00/6
Type of BT operation (1 = BTR and 0 =
BTW) 1
M0:e.x00/7
Block Transfer Timeout (TO) = 1 =
Cancel the BT operation. 2
M0:e.x00/8
These bits are reserved. M0:e.x00/9 through M0:e.x00/14
Block Transfer Enable (EN) = 1 =
Enable the BT operation. 3
M0:e.x00/15
1. Bit 7 indicates whether the SLC control program is initiating a BTR or a BTW.
2. You set bit 8 (timeout bit - TO) = 1 to cancel a BT. You can cancel a BT operation (by timing out)
once the Enabled Waiting (EW) bit sets and before the RIO scanner’s internal four second BT timer
times out or the BT completes. Cancelling a BT causes an error (ER) bit to set and an error code to
display in the M1 BT buffer. Note that the Timeout (TO) flag must be cleared before initiating a new
BT. (You can initiate a new BT by clearing the EN flag, waiting for the ER flag to clear, and then
setting the EN bit.) The RIO scanner ignores a BT request if both TO and EN flags are set at the
same time.
3. You set bit 15 = 1 to Enable (EN) a BT operation. You set this bit after you have entered all other
control information i.e., bits 7 and 8 in the M0 BT buffer. You clear this bit after either the Done
(DN) or Error (ER) bits are set in the M1 Status file. See the M1 file BT Buffer Layout section for
more details on the DN and ER bits.
There are 32 BT status buffers allocated in the M1 file. These buffers
indicate the status for all BTR and BTW operations and also contain
BTR input data. Below is the layout of BT buffer 1.
Important: The layout below is the same for all 32 M1 file BT
buffers.
M1:e.100 - Status flags that describe the status of the BTR and BTW
operations. Status flags are described in detail on the following page.
M1:e.101 - Status of actual number of BTW words sent or the
number of BTR words received.
Publication 1747-6.22