tc9021 ETC-unknow, tc9021 Datasheet - Page 2

• Manufacturer Part Number: tc9021
• Description: Gigabit Ethernet Controller
• Manufacturer: ETC-unknow

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Interrupt Coalescence
While receiving frames, the TC9021/TC9020 can be configured to operate with adaptive interrupts to maximize the
host CPU efficiency. For heavy traffic, the TC9021/TC9020 issues a single interrupt for a series of back-to-back
receive frames which reduces CPU interrupt overhead significantly. For light traffic, the TC9021/TC902 issues an
interrupt when frame arrives to minimize the latency. On the transmit side, the frequency of interrupt is
programmable on a frame by frame basis. An “interrupt-less” transmit operation is provided to further reduce
interrupt to the host CPU.
IEEE 802.1p Priority Support
The TC9021/TC9020 supports transmit packet priority queuing, allowing the host to insert higher priority frames
into the front of the transmit queue for lower latency transfer. The TC9021/TC9020 also examines the IEEE standard
priority field of appropriately tagged receive frames and generates a host system interrupt according to a user
programmable priority threshold. This mechanism provides immediate notification to the host of high priority frame
arrivals.
IEEE 802.1Q VLAN Support
The TC9021/TC9020 can be programmed to insert VLAN tags automatically into outgoing frames on a global or
individual frame basis. On the receive side, the TC9021/TC9020 examines all incoming frames for 802.1Q compliant
VLAN tags. Once a VLAN tag is detected, the TC9021/TC9020 will optionally remove the VLAN tag before uploading
the frame into system memory. The TC9021/TC9020 also offers a receive filtering mode based on either a VLAN ID
exact or hashed match.
Jumbo Frame Support
The TC9021/TC9020 can be configured to use a maximum frame size of up to 9,018 bytes. This Jumbo Frame size
reduces packet-processing overhead on the host CPU as much as 85 percent. In systems that are CPU bound, it can
provide for layer 4 throughput increases of greater than 100%.
Network Management
The TC9021/TC9020 implements management statistic counters based on IEEE 802.3 MIB and IETF RMON statistic
register sets, providing a powerful management capability
Power Management
The TC9021/TC9020 is fully compliant with PCI Power Management v1.1 and ACPI Power Management
specification v1.0. It implements multiple wakeup events including Wakeup packets, Magic Packets, and Link Status
change. The TC9021/TC9020 also supports legacy Wake-On-LAN and Magic packet power management
mechanisms.
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