5X00062G01模塊，EMERSON配置教程
并行端口接口PCCchip2提供8位雙向并行端口。全部的端口的八位必須是輸入或輸出（沒(méi)有單獨的選擇）。除了8位數據外，還有兩個(gè)控制引腳和五個(gè)狀態(tài)引腳。每個(gè)狀態(tài)引腳都可以生成一個(gè)中斷PCCCip2提供了與MVME147 PCC。在自動(dòng)選通模式下，寫(xiě)入打印機后數據寄存器，PCCCIP2自動(dòng)斷言選通*引腳打印機快速選通控制位指定的選定時(shí)間。
5X00062G01模塊，EMERSON配置教程在里面手動(dòng)模式下，打印機選通控制位直接控制選通*引腳的狀態(tài)。有關(guān)詳細信息，請參閱單板計算機程序員參考指南打印機端口接口連接的圖紙。以太網(wǎng)接口82596CA用于實(shí)現以太網(wǎng)收發(fā)器界面82596CA使用DMA操作訪(fǎng)問(wèn)本地RAM執行其正常功能。因為82596CA的內部緩沖區和VMEbus具有未定義的延遲期，如果DMA編程為訪(fǎng)問(wèn)VMEbus。因此，82596CA不應編程為訪(fǎng)問(wèn)VMEbus。每個(gè)MVME177都分配了一個(gè)以太網(wǎng)站地址。這個(gè)地址是$08003E2xxxxx，其中xxxxx是唯一的5位字節分配給電路板的編號（即，每個(gè)MVME177具有不同的xxxxx的值）。每個(gè)模塊都有一個(gè)標簽上顯示的以太網(wǎng)站地址連接到VMEbus P2連接器。此外，六個(gè)字節包括以太網(wǎng)地址存儲在配置區域中BBRAM的。也就是說(shuō)，08003E2xxxxx存儲在BBRAM中。在地址為$FFFC1F2C，可以讀取上面的四個(gè)字節（08003E2x）。在地址為$FFFC1F30時(shí)，可以讀取較低的兩個(gè)字節（xxxx）。請參閱中的BBRAM、TOD時(shí)鐘內存映射描述第3章。MVME177調試器能夠檢索或設置以太網(wǎng)地址。如果BBRAM中的數據丟失，用戶(hù)應使用恢復VMEbus P2連接器標簽。以太網(wǎng)收發(fā)器接口位于MVME177主機上工業(yè)標準連接器位于MVME712x過(guò)渡模塊。82596CA的支持功能由PCCCIP2提供。請參閱82596CA用戶(hù)指南和單板計算機詳細編程的程序員參考指南
Parallel Port Interface
The PCCchip2 provides an 8-bit bidirectional parallel port. All
eight bits of the port must be either inputs or outputs (no individual
selection). In addition to the 8 bits of data, there are two control pins
and five status pins. Each of the status pins can generate an
interruptThe PCCchip2 provides an auto-strobe feature similar to that of the
MVME147 PCC. In auto-strobe mode, after a write to the Printer
Data Register, the PCCchip2 automatically asserts the STROBE* pin
for a selected time specified by the Printer Fast Strobe control bit. In
manual mode, the Printer Strobe control bit directly controls the
state of the STROBE* pin. Refer to the Single Board Computers Programmer's Reference Guide for
drawings of the printer port interface connections.
Ethernet Interface
The 82596CA is used to implement the Ethernet transceiver
interface. The 82596CA accesses local RAM using DMA operations
to perform its normal functions. Because the 82596CA has small
internal buffers and the VMEbus has an undefined latency period,
buffer overrun may occur if the DMA is programmed to access the
VMEbus. Therefore, the 82596CA should not be programmed to
access the VMEbus.
Every MVME177 is assigned an Ethernet Station Address. The
address is $08003E2xxxxx, where xxxxx is the unique 5-nibble
number assigned to the board (i.e., every MVME177 has a different
value for xxxxx).
Each module has an Ethernet Station Address displayed on a label
attached to the VMEbus P2 connector. In addition, the six bytes
including the Ethernet address are stored in the configuration area
of the BBRAM. That is, 08003E2xxxxx is stored in the BBRAM. At an
address of $FFFC1F2C, the upper four bytes (08003E2x) can be read.
At an address of $FFFC1F30, the lower two bytes (xxxx) can be read.
Refer to the BBRAM, TOD Clock memory map description in
Chapter 3. The MVME177 debugger has the capability to retrieve or
set the Ethernet address.
If the data in the BBRAM is lost, the user should use the number on
the VMEbus P2 connector label to restore it.
The Ethernet transceiver interface is located on the MVME177 main
module, and the industry standard connector is located on the
MVME712x transition module.
Support functions for the 82596CA are provided by the PCCchip2.
Refer to the 82596CA user's guide and to the Single Board Computers
Programmer's Reference Guide for detailed programming
information
