RC82562EP Intel, RC82562EP Datasheet - Page 116

• Manufacturer Part Number: RC82562EP
• Description: IC ETH 10/100 PLC DEV CTRL 64BGA
• Manufacturer: Intel

Specifications of RC82562EP

• Rohs Status: RoHS non-compliant
• Controller Type: Ethernet Controller
• Interface: IEEE 802.3
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 64-BGA
• Current - Supply: -
• Operating Temperature: -
• Other names: 832361

Host Software Interface
6.5.4.2
6.5.4.3
6.5.5
6.6
108
Note: The device may first clear the SCB command byte and return at a later time to update new status in
Intel 8255x 10/100 Mbps Ethernet Controller Family Open Source Software Developer Manual
RU Resume Command
The RU Resume (RU_RESUME) command resumes frame reception. The RU performs the
following tasks:
RU Abort Command
The RU abort (RU_ABORT) command immediately stops frame reception and enters the idle state.
Updating SCB Status
The device updates the SCB status word when any of the following events occur.
the SCB status byte.
Flow Control
The 82557 does not have any support for flow control. However, the 82558 and later generation
controllers support frame based (IEEE) flow control (FC). In addition, the 82558 also supports a
proprietary PHY based mechanism for flow control (known as Bay flow control).
Flow control is implemented as a means of reducing the possibility of receive buffer overflows,
which can result dropped received packets, and allows local control of network congestion levels.
This can be accomplished by sending an indication to a transmitting station of an almost full
receive buffer condition at a receiving station.
1. The RU goes to the ready state and configures a new RFD if the RU is in the suspended state
2. The RU sets the RU resume request flag if the RU is in the suspended state and the device is
3. The RU ignores the command if it is not in the suspended state.
1. The RU requests an RNR interrupt if the RU is in the ready state.
2. The RU stops all DMA activity and starts discarding incoming data.
3. The device transitions the RU to the idle state.
1. When a control command is accepted. (The 8255x updates the SCB status and clears the SCB
2. When the CU or RU changes state.
3. After receiving a frame.
4. When a command with its I bit set is completed.
and not actively discarding a frame.
discarding a frame.
command word to indicate that acceptance has completed.)