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參數(shù)資料
| 型號： | S5335DK |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | PCI Bus Controller, 3.3V |
| 中文描述： | PCI總線控制器，3.3 |
| 文件頁數(shù)： | 15/189頁 |
| 文件大小： | 1193K |
| 代理商： | S5335DK |
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S5335 – PCI Bus Controller, 3.3V
Revision 5.01 – November 30, 2005
Data Sheet
AMCC Confidential and Proprietary
DS1657 15
The optional nvRAM allows the Add-On card manufac-
turer to initialize the S5335 with his specific Vendor ID
and Device ID numbers along with desired S5335
operation characteristics. The non-volatile memory
feature also provides for the Expansion BIOS and
POST code (power-on-self-test) options on the PCI
bus.
Mailbox Operation
The Mailbox Registers are divided into two four
DWORD sets. Each set is dedicated to one bus for
transferring data to the other bus. Figure 4 below
shows a block diagram of the mailbox section of the
S5335. The provision of Mailbox Registers provides
an easy path for the transfer of user information (com-
mand, status or parametric data) between the two
buses. An empty/full indication for each Mailbox Reg-
ister, at the byte level, is determined by polling a
Status Register accessible to both the PCI and Add-
On buses. Providing Mailbox byte level empty/full indi-
cations allows for greater flexibility in 8-, 16- or 32-bit
system interfaces. i.e., transferring a single byte to an
8-bit Add-On bus without requiring the assembling or
disassembling of 32-bit data.
The generation of interrupts from Mailbox Registers is
equivalent with the commonly known ‘DOORBELL’
interrupt technique. Bit locations configured within the
S5335’s Operation Registers select a Mailbox and
Mailbox byte which is to generate an interrupt when
full or touched. A mailbox interrupt control register is
then used to enable interrupt generation and to select
if the interrupt is to be generated on the PCI or Add-On
Local bus. PCI Local bus interrupts may also be gen-
erated from direct hardware interfacing due to a
unique AMCC feature. A dedicated Mailbox byte is
directly accessible via a set of hardware device signal
pins. A mailbox load signal pin latches Add-On bus
data directly into the Mailbox initiating a PCI bus inter-
rupt if enabled. Mailbox data may also be read in a
similar manner. This option is shared with the byte
wide non-volatile memory signal pins. The S5335
must use the serial nvRAM for the direct mailbox
option signal pins to be available or they are assigned
to the byte wide at power up.
Table 3. Add-On Bus Operation Registers
Add-On Bus Operation Registers
Address
Incoming Mailbox Register 1 (AIMB1)
00h
Incoming Mailbox Register 2 (AIMB2)
04h
Incoming Mailbox Register 3 (AIMB3)
08h
Incoming Mailbox Register 4 (AIMB4)
0Ch
Outgoing Mailbox Register 1 (AOMB1)
10h
Outgoing Mailbox Register 2 (AOMB2)
14h
Outgoing Mailbox Register 3 (AOMB3)
18h
Outgoing Mailbox Register 4 (AOMB4)
1Ch
FIFO Port (AFIFO)
20h
Bus Master Write Address Register (MWAR)
24h
Pass-Thru Address Register (APTA)
28h
Pass-Thru Data Register (APTD)
2Ch
Bus Master Read Address Register (MRAR)
30h
Mailbox Empty/Full Status Register (AMBEF)
34h
Interrupt Control/Status Register (AINT)
38h
General Control/Status Register (ARCR)
3Ch
Bus Master Write Transfer Count (MWTC)
58h
Bus Master Read Transfer Count (MRTC)
5Ch
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