參數(shù)資料
型號(hào)： 24888
英文描述： Preliminary AMD-8151 HyperTransport AGP3.0 Graphics Tunnel Data Sheet
中文描述： 初步的AMD - 8151 HyperTransport的AGP3.0圖形隧道數(shù)據(jù)表
文件頁數(shù)： 25/45頁
文件大?。?/td> 755K
代理商： 24888
24888 Rev 3.02 - June 17, 2003
AMD-8151
TM
AGP Tunnel Data Sheet
25
Link Configuration And Control Register
DevA:0xC4 and DevA:0xC8
DevA:0xC4 applies side A of the tunnel and DevA:0xC8 applies to side B of the tunnel. The default value for
bit[5] may vary (see the definition).
Default: 11 0020h for DevA:0xC4 and 00 0020h for DevA:0xC8.Attribute: See below.
Bits
Description
31
Reserved.
30:28
LWO: link width out.
Read-write. Specifies the operating width of the outgoing link. Legal values
are 001b (16 bits; DevA:0xC4 only), 000b (8 bits), 101b (4 bits), 100b (2 bits), and 111b (not
connected). Note: this field is cleared by PWROK reset but not by RESET#; the default value of this
field depends on the widths of the links of the connecting device, per the link specification. Note:
after this field is updated, the link width does not change until either RESET# is asserted or a link
disconnect sequence occurs through or LDTSTOP#.
27
Reserved.
26:24
LWI: link width in.
Read-write. Specifies the operating width of the incoming link. Legal values are
001b (16 bits; DevA:0xC4 only), 000b (8 bits), 101b (4 bits), 100b (2 bits), and 111b (not connected).
Note: this field is cleared by PWROK reset but not by RESET#; the default value of this field depends
on the widths of the links of the connecting device, per the link specification. Note: after this field is
updated, the link width does not change until either RESET# is asserted or a link disconnect sequence
occurs through an LDTSTOP# assertion.
23
Reserved.
22:20
Max link width out.
Read only. This specifies the width of the outgoing link to be 16 bits wide for
side A and 8 bits wide for side B.
19
Reserved.
26
MASHST: master host.
Read; set and cleared by hardware. This bit indicates which link is the path
to the master (or only) host bridge on the HyperTransport technology chain. 1=The hardware set
this bit as a result of a write command from the B side of the tunnel to any of the bytes of
DevA:0xC0[31:16]. 0=The hardware cleared this bit as a result of a write command from the A side
of the tunnel to any of the bytes of DevA:0xC0[31:16]. This bit, along with DEFDIR, is used to
determine the side of the tunnel to which AGP master requests are sent.
25:21
UnitID count.
Read only. Specifies the number of UnitIDs used by the IC (three).
20:16
BUID: base UnitID.
Read-write. This specifies the link-protocol base UnitID. The IC's logic uses
this value to determine the UnitIDs for link request and response packets. When a new value is
written to this field, the response includes a UnitID that is based on the new value in this register.
Note: some legacy operating systems may require that this value be set to zero for normal operation
so that the AGP capability block is part of device 0. Since the IC does not use the base unit ID in any
link transactions, there is no conflict with the host unit ID. However, at boot, BIOS is required to
temporarily change the BUID value of the IC so that the BUID values in downstream devices may be
initialized. After downstream BUID values are initialized, this field may be set to zero to be
compatible with legacy operating systems.
15:8
Reserved.
7:0
Capabilities ID.
Read only. Specifies the capabilities ID for link configuration space.
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參數(shù)描述
248-8886-007 制造商:ITT Interconnect Solutions 功能描述:248-8886-007 / 248-8886-007 / D Sub
248-8887-007 制造商:ITT Interconnect Solutions 功能描述:248-8887-007 / 248-8887-007 / D Sub
248-8888-007 制造商:ITT Interconnect Solutions 功能描述:248-8888-007 / 248-8888-007 / D Sub
248-8889-007 制造商:ITT Interconnect Solutions 功能描述:248-8889-007 / 248-8889-007 / D Sub
248-8890-007 制造商:ITT Interconnect Solutions 功能描述:248-8890-007 / 248-8890-007 / D SUB
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