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Register Descriptions Chapter 4
GPIB-1014 User Manual 4-44 © National Instruments Corporation
Address Register 1 (ADR1)
VMEbus Address: Base Address + 11F (hex)
Attributes: Read Only, Internal to TLC
76543210
EOI
DT1 DL1 AD5-1 AD4-1 AD3-1 AD2-1
AD1-1
R
Address Register 1 (ADR1) indicates the status of the GPIB address and enable bits for the
secondary address of the TLC if mode 2 addressing is used, or the minor primary address of the
TLC if dual-primary addressing is used (modes 1 and 3). If mode 1 addressing is used and only
a single-primary address is needed, both the talk and listen addresses disable in this register. If
mode 2 addressing is used, the talk and listen disable bits in this register must match those in
ADR0.
Bit Mnemonic Description
7r EOI End Or Identify Bit
EOI indicates the value of the GPIB EOI line latched when a data byte
is received by the TLC GPIB Acceptor Handshake (AH) function. If
EOI=1, the EOI line was asserted with the received byte. EOI is
cleared by pon or by using the Chip Reset auxiliary command. EOI is
updated after each byte is received.
6r DT1 Disable Talker 1 Bit
If DT1 is set, the mode 2 secondary (or mode 1 and 3 minor) Talker
function is not enabled; that is, the TLC does not respond to a
secondary address (or minor primary talk address) formed from bits
AD[5-1 – 1-1]. If DT1 is cleared, the secondary address is checked
only if the TLC received its primary talk address (that is, is in TPAS).
5r DL1 Disable Listener 1 Bit
If DL1=1, the mode 2 secondary (or mode 1 and 3 minor) listen
function is not enabled; that is, the TLC does not respond to a
secondary address (or minor primary listen address formed from bits
AD5-1 through AD1-1). If DL1 is cleared and the TLC received its
primary listen address (that is, is in LPAS), the secondary address is
checked.
4-0r AD[5-1 – 1-1] Mode 2 Secondary TLC GPIB Address Bits 5-1 through 1-1
These are the lower five bits of the TLC secondary or minor address.
The secondary address is formed by adding hex A0 to bits
AD[5-1 – 1-1]. The minor talk address is formed by adding hex 40 to
AD[5-1 – 1-1], while the listen address is formed by adding a hex 20.