Cxc Interface - PEP VM162 User Manual

VM162/VM172

2.9 CXC Interface

The Controller Extension Connector (CXC) is a local mezzanine interface. The CXC contains a 16-bit
data bus, 7 address lines and 8 decoded chip select lines. In total, there are 8 control signals. The base
address of the CXC can be programmed via the CS5 line of the 68EN360. The 8 CXC chip selects
(CXC_CS0 - CXC_CS7) occupy 256 Bytes each and have an address length of 400H (512 Bytes).
Furthermore, the CXC contains 4 IRQ capability (4 edge sensitive IRQs), DMA capability (1 channel,
DREQ + DACK), serial ports (3 channels, Full MODEM) and a set of parallel port signals. These spe-
cial CXC functions are based on the 68EN360 resources.
For general CXC information, including generic pinouts and a comparison of the 68(EN)360 and 68302
CPU pinouts on the CXC, please refer to the CXC Specification User's Manual and the CXC Appendix
attached to this manual.
Table 2.10: CXC Pinouts using the 68(EN)360
Pin Row A Signals
1 PC0/_RTS1/L1ST1
2 PC1/_RTS2/L1ST2
3 PC2/_RTS3/_L1RQB/L1ST3
4 PC3/_RTS4/_L1RQA/L1ST4
5 PB0/_SPISEL/_RRJCT1
6 PB1/SPICLK/_RSTRT2
7 VCC
8 PB2/SPIMOSI(SPITXD)/_RRJCT2
9 PB3/SPIMISO(SPIRXD)/BRGO4
10 PB8/_SMSYN1/_DREQ2
11 PB16/BRGO3/STRBO
12 PB9/_SMSYN2/_DACK2
13 PB17/_RSTRT1/STRBI
14 VCC
15 _CS-CXC (CS5 of 68360)
16 _AS
17 R/_W
18 _UDS
19 _LDS
20 VCC
21 A1
22 A2
23 A3
24 A4
25 A5
26 VCC
27 D0
28 D1
29 D2
30 D3
31 D4
32 D5
Page 2- 24
Chapter 2 Functional Description
Row B Signals
PA8/CLK1/BRGO1/L1RCLKA/TIN1
PA10/CLK3/BRGO2/L1TCLKA/TIN2
GND
PA3/TXD2
PB13/_RTS2/L1ST2
GND
PB15/_RTS4/_L1RQA_L1ST4
PC11/_CD4/_L1RSYNCA
GND
PA2/RXD2
PB10/SMTXD2/L1CLKOB
GND
PC6/_CTS2
PC7/_CD2/_TGATE2
GND
PC10/_CTS4/_L1TSYNCA/_SDACK1
_SYSR
GND
_EDTACK
16 MHz CLOCK
GND
_CXC-CS0
_CXC-CS1
GND
A6
A7
GND
D6
D7
GND
D8
D9
© PEP Modular Computers
Row C Signals
PB6/SMTXD1/_DONE1
PB5/BRGO2/_DACK1
PB4/BRGO1/_DREQ1
PB11/SMRXD2/L1CLKOA
PA14/CLK7/BRGO4/TIN4
PA15/CLK8/_TOUT4/L1TCLKB
VCC
PA7/TXD4/L1RXDA
PA6/RXD4/L1TXDA
PB7/SMRXD1/_DONE2
PC9/_CD3/_L1RSYNCB
PB14/_RTS3/_L1RQB/L1ST3
PC8/_CTS3/_L1TSYNCB/SDACK2
VCC
PA12/CLK5/BRGO3TIN3
PA13/CLK6/_TOUT3/L1RCLKB/BRGCLK2
PA5/TXD3/L1RXDB
PA4/RXD3/L1TXDB
VCC
_CXC-CS2
_CXC-CS3
_CXC-CS4
_CXC-CS5
_CXC-CS6
_CXC-CS7
VCC
D10
D11
D12
D13
D14
D15
Juli 23, 1997