2-8 General Description Date Code 20010518
SEL-2020 Instruction Manual
Status and Configuration, Archive Counter (nonvolatile Flash memory only), Local
elements, Special Command Registers (SBO and CMD), FID String of attached device, and
Port Identification String.
Local elements are logical “1” when asserted or true, and “0” if not asserted or false. The Local
elements, as the name implies, reside in the Local data region on each port. These elements can
be used in any SEL
OGIC Control Equation to define a trigger condition. When the condition is
true, the SEL-2020 will send the message associated with the SEL
OGIC Control Equation, such as
requesting data or issuing a control command.
Table 2.2 lists the SEL-2020 Local elements associated with each port. A brief description of
these elements and their function follows the table.
Table 2.2: SEL-2020 Local Elements for Each Port
Row Local Elements
0 CMD1 CMD2 CMD3 CMD4 CMD5 CMD6 CMD7 CMD8
1 SBO1 SBO2 SBO3 SBO4 CTS XOFF INAC UMB
2 D1 D2 D3 D4 D5 D6 D7 D8
3 D9 D10 D11 D12 ARCH1 ARCH2 ARCH3 MSET
4 DLY1 DLY2 DLY3 DLY4 DLY5 DLY6 DLY7 DLY8
5 DLY9 DLY10 DLY11 DLY12 DLYA1 DLYA2 DLYA3 DLY
6 BR1 BR2 BR3 BR4 BR5 BR6 BR7 BR8
7 BR9 BR10 BR11 BR12 BR13 BR14 BR15 BR16
8 RB1 RB2 RB3 RB4 RB5 RB6 RB7 RB8
9 RB9 RB10 RB11 RB12 RB13 RB14 RB15 RB16
10 SBR1 SBR2 SBR3 SBR4 SBR5 SBR6 SBR7 SBR8
11 SBR9 SBR10 SBR11 SBR12 SBR13 SBR14 SBR15 SBR16
12 SRB1 SRB2 SRB3 SRB4 SRB5 SRB6 SRB7 SRB8
13 SRB9 SRB10 SRB11 SRB12 SRB13 SRB14 SRB15 SRB16
14 CBR1 CBR2 CBR3 CBR4 CBR5 CBR6 CBR7 CBR8
15 CBR9 CBR10 CBR11 CBR12 CBR13 CBR14 CBR15 CBR16
16 CRB1 CRB2 CRB3 CRB4 CRB5 CRB6 CRB7 CRB8
17 CRB9 CRB10 CRB11 CRB12 CRB13 CRB14 CRB15 CRB16
Row 0: Command elements, CMD1 to CMD8, are each associated with one of the eight
user-defined commands. The associated CMD bit is asserted when the
SEL-2020 receives the user-defined command.
Row 1: Select-Before-Operate elements, SBO1 to SBO4, assert when two specific
messages are sent in proper time sequence. Clear-To-Send element, CTS, is
asserted when the CTS line is “up”; Transmit-OFF element, XOFF, is asserted
when the SEL-2020 receives an XOFF signal from the attached device; the
inactive element, INAC, is set when the port is inactive; and the Unsolicited-
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