參數(shù)資料
型號(hào): PC107AVGHU100LC
廠商: ATMEL CORP
元件分類: 外設(shè)及接口
英文描述: PCI Bridge Memory Controller
中文描述: MULTIFUNCTION PERIPHERAL, CBGA503
封裝: 33 X 33 MM, HITCE, CERAMIC, BGA-503
文件頁數(shù): 44/50頁
文件大?。?/td> 453K
代理商: PC107AVGHU100LC
44
PC107A [Preliminary]
2137C–HIREL–03/04
Pull-up/Pull-down
Resistor Requirements
The data bus input receivers are normally turned off when no read operation is in
progress; therefore, they do not require pull-up resistors on the bus. The processor data
bus signals are: DH[0
31], DL[0
31], and PAR[0
7]. The memory data bus signals are:
MDH[0
31], MDL[0
31], and PAR/AR[0
7].
If the 32-bit data bus mode is selected, the input receivers of the unused data and parity
bits (DL[0
31], DP[4
7], MDL[0
31], and PAR[4
7]) will be disabled, and their outputs
will drive logic zeros when they would otherwise normally be driven. For this mode,
these pins do not require pull-up resistors, and should be left unconnected by the sys-
tem to minimize possible output switching.
It is recommended that ARTRY, TA, and TS have weak pull-up resistors (2 k
10 k
)
connected to BV
DD
.
It is recommended that MTP[1
2] and TEST2 have weak pull-up resistor (2 k
10 k
)
connected to GV
DD
.
It is recommended that the following signals be pulled up to OV
DD
with weak pull-up
resistors (2 k
10 k
): SDA, SCL, TEST1, and FTP[3
3].
It is recommended that the following PCI control signals be pulled up to LV
DD
with weak
pull-up resistors (2 k
10 k
): DEVSEL, FRAME, IRDY, LOCK, PERR, SERR, STOP,
TRDY and INTA. The resistor values may need to be adjusted stronger to reduce
induced noise on specific board designs.
The following pins have internal pull-up resistors enabled at all times: REQ[06
4], TCK,
TDI, TMS, and TRST, BR1, HRESET_CPU, MCP, QACK, SRESET, TEST and
TRIG_OUT. See Table 1, “PC107A Pinout Listing,” on page 5 for more information.
The following pins have internal pull-up resistors enabled only while device is in the
reset state: MDL0, FOE, RCS0, SDRAS, SDCAS, CKE, SDBAO, and SDMA[10
1]. See
Table 1, “PC107A Pinout Listing,” on page 5 for more information.
The following pins are reset configuration pins: MDL0, FOE, RCS0, SDBAO, SDMA[10
1], and PLL_CFG[0
3]. These pins are sampled during reset to configure the device.
Any other unused active low input pins should be tied to a logic one level via weak pull-
up resistors (2 k
10 k
) to the appropriate power supply listed in Table 3 on page 12.
Unused active high input pins should be tied to GND via weak pull-down resistors
(2 k
10 k
).
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