88e3016 Marvell Semiconductor, Inc., 88e3016 Datasheet - Page 47

• Manufacturer Part Number: 88e3016
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

using the sample/preload instruction. Thus, when the change to the extest instruction takes place, known data is
driven immediately from the PHY to its external connections.
2.14.4 The Clamp Instruction
The clamp instruction allows the state of the signals driven from component pins to be determined from the bound-
ary-scan register while the bypass register is selected as the serial path between TDI and TDO. The signals driven
from the component pins will not change while the clamp instruction is selected.
2.14.5 The HIGH-Z Instruction
The HIGH-Z instruction places the component in a state in which all of its system logic outputs are placed in an
inactive drive state (e.g., high impedance). In this state, an in-circuit test system may drive signals onto the con-
nections normally driven by a component output without incurring the risk of damage to the component.
2.14.6 ID CODE Instruction
The ID CODE contains the manufacturer identity, part and version.
Copyright © 2006 Marvell
May 4, 2006, Advance
Table 27:
Ver sio n
Bit 31 to 28
0000
ID CODE
Part Num ber
Bit 27 to 12
0000 0000 0010 0001
Document Classification: Proprietary Information
CONFIDENTIAL
001 1110 1001
Man ufa ctur er Id en tity
Bit 11 to 1
Doc. No. MV-S103164-00, Rev. --
IEEE 1149.1 Controller
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1
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