the PCI Bus demystified phần 2 pdf

... monopolize the bus. This violates the low-latency spirit of the PCI spec. On the other hand, the specification does allow the notion of bus parking.” The arbiter may be designed to “park” the bus on ... While the choice of a default master is up to the system designer, the specification recommends parking on the last master that acquired the bus. PCI Bus...

Ngày tải lên: 07/08/2014, 11:22

... string. If the service is present, the Service Directory returns the base address, length and entry point of the code image for the service. BIOS Services The functions making up the PCI BIOS fall ... Options Set PCI IRQ PCI Bus Demystified ENTRY: EAX Service identifier. 4-character string “ $PCI (049435 024 h) EBX Function code in BL. 0 is the only function currentl...

Ngày tải lên: 07/08/2014, 11:22

... immediately issues a retry to the master and begins executing the transaction internally. This allows the bus to be used by other masters while the target is busy. PCI Bus Demystified 39 least significant ... interrupt signal. The mechanism for invoking multiple ISRs is called “chaining.” PCI Bus Demystified Table 4-1 Interrupt PCI PCI PCI PCI Controller Slot Slot...

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... ACK64#. PCI Bus Demystified 60 supply the interrupt vector. The C/BE# bus indicates which bytes of the interrupt vector are valid. Because PCI is processor independent, we don’t necessarily know the ... arrangement. The “Thevenin equivalent” impedance of the 180/330 ohm divider is 120 ohms while the divider maintains an open-circuit voltage of 3.4 volts. PCI Bus D...

Ngày tải lên: 07/08/2014, 11:22

... MHz, the specification places limits on the trace length of PCI signals on expansion boards. The 32- bit interface signals are limited to 1.5" from the top edge of the connector to the PCI ... connecting to the PCI align exactly with the PCI connector pinout as shown in Figure 5- 12. This contributes to shorter, more consistent stub lengths. PCI Bus Demystifi...

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... 1 PCI Bus 3 PCI- PCI Bridge 2 PCI- PCI Bridge 4 PCI- PCI Bridge 5 PCI Bus 2 PCI Bus 4 PCI Bus 5 Pri Bus Sec Bus Sub Bus Bridge 0 Bridge 1 Bridge 2 Bridge 3 Bridge 4 Bridge 5 0 1 0 3 3 0 1 2 3 4 5 5 2 2 5 4 5 127 PCI ... bridge hierarchy. Host -PCI Bridge Memory CPU Host Bus PCI Device PCI- PCI Bridge 1 PCI- ISA Bridge PCI- PCI Bridge 2 PCI Dev...

Ngày tải lên: 07/08/2014, 11:22

... to leverage the efficiencies of scale resulting from the high volumes inherent in the desktop world. So it is with CompactPCI. CompactPCI C H A P T E R 9 158 PCI Bus Demystified J2-A 22 J2-B 22 J2-C 22 J2-D 22 ... in Table 9 -2. Logical Slot REQ# GNT# IDSEL 2 REQ0# GNT0# AD31 3 REQ1# GNT1# AD30 4 REQ2# GNT2# AD29 5 REQ3# GNT3# AD28 6 REQ4# GNT4# AD27 7 REQ5# GNT5# AD26 8 RE...

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... insertion event the system activates the software connection process for the inserted board. For an extraction event the system activates the PCI Bus Demystified 175 the active bus. Note that there is ... termination of the bus signals. CompactPCI 169 ■ Power up the slot ■ Deassert RST# and connect the slot to the bus, in either order. ■ Change the optional slo...

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... (1) PME# 20 AD[31] AD[30] 21 AD [29 ] +3.3V 22 Gnd AD [28 ] 23 AD [27 ] AD [26 ] 24 AD [25 ] Gnd 25 +3.3V AD [24 ] 26 C/BE[3] IDSEL 27 AD [23 ] +3.3V 28 Gnd AD [22 ] 29 AD [21 ] AD [20 ] 30 AD[19] Gnd 31 +3.3V AD[18] 32 ... 1 32 133 bus number registers, 130–1 32 compact PCI, 1 62 164 configuration address types, 128 –130 hierarchies, 125 – 128 host to PCI, 125 – 126 inte...

Ngày tải lên: 07/08/2014, 11:22

... Figure 1 -2 for more detail. Figure 1 -2: Functional diagram of the VL Bus. The VL Bus solved the bandwidth problem (in the short term anyway). On a 33 MHz, 32- bit processor bus, the VL Bus could achieve ... Bus 10 Introducing PCI 11 Features 11 The PCI Special Interest Group 12 PCI Signals 13 Signal Groups 13 Signal Types 18 Sideband Signals 19 Definitions 20 S...

Ngày tải lên: 07/08/2014, 11:22