參數(shù)資料
型號(hào): PC8245
廠商: Atmel Corp.
英文描述: Integrated Processor Family
中文描述: 綜合處理器系列
文件頁(yè)數(shù): 34/61頁(yè)
文件大?。?/td> 429K
代理商: PC8245
34
PC8245
2171D–HIREL–06/04
3. PCI bused signals are composed of the following signals: LOCK, IRDY, C/BE[3:0], PAR, TRDY, FRAME, STOP, DEVSEL,
PERR, SERR, AD[31:0], REQ[4:0], GNT[4:0], IDSEL, INTA.
4. In order to meet minimum output hold specifications relative to PCI_SYNC_IN for both 33 and 66 MHz PCI systems, the
PC8245 has a programmable output hold delay for PCI signals (the PCI_SYNC_IN to output valid timing is also affected).
The initial value of the output hold delay is determined by the values on the MCP and CKE reset configuration signals; the
values on these two signals are inverted then stored as the initial settings of PCI_HOLD_DEL = PMCR2[5:4] (power man-
agement configuration register 2 <0x72>), respectively. Since MCP and CKE have internal pull-up resistors, the default
value of PCI_HOLD_DEL after reset is 0b00. Further output hold delay values are available by programming the
PCI_HOLD_DEL value of the PMCR2 configuration register. See Figure 17 on page 35.
Figure 16.
AC Test Load for the PC8245
OUTPUT
Z0 = 50
OV
DD
/2 for PCI
OV
DD
/2 for Memory
RL = 50
Output measurements are made at the device pin
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