參數(shù)資料
型號: STP1100BGA-100
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 100 MHz, RISC PROCESSOR, PBGA272
封裝: PLASTIC, BGA-272
文件頁數(shù): 30/32頁
文件大?。?/td> 168K
代理商: STP1100BGA-100
7
SPARC v8 32-Bit Microprocessor With PCI/DRAM Interfaces
microSPARC-IIep
STP1100BGA
Preliminary
December 1997
Sun Microsystems, Inc
PCI_INT_L[7:0]
(IRL_L[3:0])
I/O
6.
Interrupt Requests. Sent to the microSPARC-IIep interrupt controller. If the PCI internal
interrupt controller is disabled, interrupt requests can be triggered by software and sent to
an external interrupt controller. For PCI, the interrupt signals should be connected as
following:
INTH#: PCI_INT_L[7] INTD#: PCI_INT_L[3]
INTG#: PCI_INT_L[6] INTC#: PCI_INT_L[2]
INTF#: PCI_INT_L[5] INTB#: PCI_INT_L[1]
INTE#: PCI_INT_L[4] INTA#: PCI_INT_L[0]
If PCI_INT_L[7:4] are used in a 5 volt PCI bus, the inputs have the potential of driving to
greater than 5 volts and external clamping diodes to 5 volts are required (PCI_INT_L[3:0]
are internally clipped to VDD2).
If the PCI internal interrupt controller is disabled, PCI_INT_L[3:0] can be used to function
as the SPARC interrupt request lines (IRL[3:0]) as dened in SPARC version 8.
PCI_REQ[3:0]#
In
2.
Bus Request.
In PCI Host mode, microSPARC-IIep internal PCI bus arbiter receives REQ# from other
PCI masters.
In PCI Satellite mode, PCI_REQ#[0] functions as PCI Bus Grant signal (SAT_GNT_L)
and PCI_REQ#[1] functions as PCI Initialization Device Select signal (IDSEL). The
remaining PCI_REQ#[3:2] signals should be tied high.
PCI_GNT[3:0]#
Out
2.
Bus Grant.
In PCI Host mode, microSPARC-IIep internal PCI bus arbiter sends GNT# to other PCI
masters.
In PCI Satellite mode, PCI_GNT#[0] functions as PCI Bus Request signal (SAT_REQ_L).
DRAM and Flash Memory Signals
Signal
Type
Note
Description
MEMDATA[63:0]
I/O
1.
64-bit bi-directional memory data bus accesses DRAM and ash memory. [31:0] or [7:0]
are used dependent on width of ash memory interface.
MEMPAR[1:0]
I/O
1.
Bi-directional memory data parity pins for DRAM only.
[0] is for MEMDATA[31:0] while [1] is for MEMDATA[63:32]. Parity is optional.
MEMADDR[11:0]
Out
3.
DRAM Address output pins. Require external buffering to provide the sufcient drive.
RAS_L[7:0]
Out
3.
DRAM Row Address Strobe. Eight separate RAS signals to support eight banks of
DRAM.
Require external buffering to provide sufcient drive.
CAS_L[3:0]
Out
3.
DRAM Column Address Strobes. Two pairs of CAS signals with each pair supporting four
banks of DRAM. Require external buffering to provide sufcient drive.
MWE_L
Out
3.
DRAM Write Enable output pin. Require external buffering to provide sufcient drive.
MOE_L
Out
3.
DRAM Output Enable output pin. Require external buffering to provide sufcient drive.
SIMM32_SEL
In
4.
DRAM Double-Density SIMM and DIMM select. Disables dual-RAS mode under
fast-page mode.
ROM_ADDR[23:0]
Out
3.
Flash memory Address bus (Byte address).
PCI Signals (Continued)
Signal
Type
Note
Description
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