参数资料
型号: GT-48002A
厂商: Galileo Technology Services, LLC
英文描述: Switched Fast Ethernet Controller for 100BaseX(100BaseX交换式快速以太网控制器)
中文描述: 交换式快速以太网控制器(100BaseX交换式快速以太网控制器的100BaseX)
文件页数: 40/102页
文件大小: 1001K
代理商: GT-48002A
GT-48002A Switched Fast Ethernet Controller
42
Revision 1.2
10.3.7 PACKET_TRANSFER Message (GalNet to CPU 16 Block Buffer)
A burst of up to 8 32-bit words from the source GalNet device to the target CPU buffer which contains the packet. This
message is used when the GalNet device forwards one of the following packets directly to the CPU 16 block buffer:
Unicast packets destined for the CPU (Device Number in the address table is equal to the CPU number)
Multicast packets
Unknown packets (if set by bit 6 in the Global Control Register, 0x140028)
BPDU messages
Sniffer packets when the CPU is the target sniffer
EASE packets
The data is entered starting at the 8th word (33rd byte) of the next free block. Words 1 to 7 are left empty for user pur-
poses. The address of this packet transfer is based upon the CPU Buffer Base Address.
Table 17: PACKET_TRANSFER Message (GalNet to CPU)
The PACKET_TRANSFER message can be transferred using any burst size over the PCI. The GalNet device uses a
burst of 8 words.
10.3.8 PACKET_TRANSFER Message (GalNet to CPU in Unicast Intervention Mode)
A burst of up to 8 32-bit words from the source GalNet device to the target CPU buffer which contains the unicast
packet whose address is tagged for intervention mode. The first data word of the packet will be written to second word
of the buffer. The first word is left empty for the END_OF_PACKET message.
Table 18: PACKET_TRANSFER Message (GalNet to CPU)
PCI Bi ts
D escr ip tio n
Address
[31:15]
[14:11]
[10:2]
[1:0]
CPU Buffer Base Address (0x140034)
Offset Counter (16 total blocks)
Address within the buffer
‘0’
Data 0
[31:0]
Data 0
----
Data 7
[31:0]
Data 7
PCI Bi ts
D escr ip tio n
Address
[31:27]
[26:22]
[21]
[20:0]
GalNet Protocol Region
CPU Device Number (bits [12:8] in 0x1400 30)
‘1’ (DRAM)
DRAM location
Data 0
[31:0]
Data 0
----
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