Unibus signals on A/B slot from "d:\RetroCmp\dec\pdp11\unibus\pdp-11 UNIBUS DESIGN DESCRIPTION 1979.pdf" Data Transfer, Priority Arbitration and Initialization Signals Lines -------------------------------------------------------------------------------- MNEMONIC NO. FUNCTION NAME LINES OF LEVEL ASSERTION -------------------------------------------------------------------------------- A. DATA TRANSFER SECTION Address A <17:00> 18 Selects slave device Low and/or memory address Data D <15:00> 16 Information transfer Low Control* C0, C1 2 Type of data transfer Low Master Sync MSYN 1 { Timing control for Low Slave Sync SSYN 1 { data transfer Low Parity** PA, PB 2 Device parity error Low Interrupt INTR 1 Interrupt Low B. PRIORITY ARBITRATION SECTION Bus Request BR4,BR5,BR6,BR7 4 Request use of bus Low (usually for interrupt) Bus Grant BG4,BG5,BG6,BG7 4 Grant use of Bus High (usually for interrupt) Non-Processor NPR 1 Request use of bus Low Request for data transfers Non-Processor NPG 1 Grant use of bus High Grant for data transfers Selection SACK 1 Acknowledges grant Low Acknowledge Bus Busy BBSY 1 Indicates that the Low data section is in use C. INITIALIZATION SECTION Initialize INIT 1 System reset Low AC Low ACLO 1 { Low { Power monitoring DC Low DCLO 1 { Low *Control lines C0, C1: NAME MNEMONIC C1,C0 FUNCTION Data In DATI 0,0 One word of data from slave to master Data In, Pause DATIP 0,1 Same as DATI, but inhibits restore cycle in destructive read-out devices. Must be followed by DATO or DATOB to the same location. Data Out DATO 1,0 One word of data from master to slave. Data Out, Byte DATOB 1,1 One byte of data from master to slave. Data on D<15:08> for A00=1, D<07:00> for A00=0 **Parity Indicator PA,PB PA,PB 0,0 no error in a slave in DATI/P 0,1 error in slave in DATI/P 1,X reserved LEDs are useful on: +5V 1 INIT, ACLO, DCLO 3 *P, *G ? 2*(4+1) = 10 SACK? 1 BBSY? 1 ================================================================================ Pin identifer= / / / 1 2x20 Berg B 1 2x20 Berg A / / ::::::::::::::: :::::::::::::::: / / 40 40 / / Components = / / Side 1 / / / Solder = / Slot = Slot = / Side 2 / B ,_ A / / ,___/ / / /_//////////////////_/ /_//////////////////_/ Contact = VUTSRPNMLKJHFEDCBA VUTSRPNMLKJHFEDCBA Signals by Backplane pin ------------------------- 2x20 2x20 PIN BERG SIGNAL PIN BERG SIGNAL AA1 A36 INITL BA1 B36 BG6H AA2 A35 POWER (+5V) BA2 B35 POWER (+5V) AB1 A34 INTRL BB1 B34 BG5H AB2 A33 GROUND BB2 B33 GROUND AC1 A32 D00L BC1 B32 BR5L AC2 A31 GROUND BC2 B31 GROUND AD1 A30 D02L BD1 B30 GROUND AD2 A29 D01L BD2 B29 BR4L AE1 A28 D04L BE1 B28 GROUND AE2 A27 D03L BE2 B27 BG4H AF1 A26 D06L BF1 B26 ACLOL AF2 A25 D05L BF2 B25 DCLOL AH1 A24 D08L BH1 B24 A01L AH2 A23 D07L BH2 B23 A00L AJ1 A22 D10L BJ1 B22 A03L AJ2 A21 D09L BJ2 B21 A02L AK1 A20 D12L BK1 B20 A05L AK2 A19 D11L BK2 B19 A04L AL1 A18 D14L BL1 B18 A07L AL2 A17 D13L BL2 B17 A06L AM1 A16 PAL BM1 B16 A09L AM2 A15 D15L BM2 B15 A08L AN1 A14 GROUND BN1 B14 A11L AN2 A13 PBL BN2 B13 A10L AP1 A12 GROUND BP1 B12 A13L AP2 A11 BBSYL BP2 B11 A12L AR1 A10 GROUND BR1 B10 A15L AR2 A09 SACKL BR2 B09 A14L AS1 A08 GROUND BS1 B08 A17L AS2 A07 NPRL BS2 B07 A16L AT1 A06 GROUND BT1 B06 GROUND AT2 A05 BR7L BT2 B05 C1L AU1 A04 NPGH BU1 B04 SSYNL AU2 A03 BR6L BU2 B03 C0L AV1 A02 BG7H BV1 B02 MSYNL AV2 A01 GROUND BV2 B01 GROUND Signals by name 2x20 2x20 2x20 Signal PIN BERG Signal PIN BERG Signal PIN BERG A00L BH2 B23 D00L AC1 A32 GROUND AB2 A33 A01L BH1 B24 D01L AD2 A29 GROUND AC2 A31 A02L BJ2 B21 D02L AD1 A30 GROUND AN1 A14 A03L BJ1 B22 D03L AE2 A27 GROUND AP1 A12 A04L BK2 B19 D04L AE1 A28 GROUND AR1 A10 A05L BK1 B20 D05L AF2 A25 GROUND AS1 A08 A06L BL2 B17 D06L AF1 A26 GROUND AT1 A06 A07L BL1 B18 D07L AH2 A23 GROUND AV2 A01 A08L BM2 B15 D08L AH1 A24 GROUND BB2 B33 A09L BM1 B16 D09L AJ2 A21 GROUND BC2 B31 A10L BN2 B13 D10L AJ1 A22 GROUND BD1 B30 A11L BN1 B14 D11L AK2 A19 GROUND BE1 B28 A12L BP2 B11 D12L AK1 A20 GROUND BT1 B06 A13L BP1 B12 D13L AL2 A17 GROUND BV2 B01 A14L BR2 B09 D14L AL1 A18 INITL AA1 A36 A15L BR1 B10 D15L AM2 A15 INTRL AB1 A24 A16L BS2 B07 DCLOL BF2 B25 MSYNL BV1 B02 A17L BS1 B08 NPGH AU1 A04 ACLOL BF1 B26 NPRL AS2 A07 BBSYL AP2 A11 PAL AM1 A16 BG4H BE2 B27 PBL AN2 A13 BG5H BB1 B34 POWER (+5V) AA2 A35 BG6H BA1 B36 POWER (+5V) BA2 B35 BG7H AV1 A02 SACKL AR2 A09 BR4L BD2 B29 SSYNL BU1 B04 BR5L BC1 B32 BR6L AU2 A03 BR7L AT2 A05 C0L BU2 B03 C1L BT2 B05