KSZ9021GN TR Micrel Inc, KSZ9021GN TR Datasheet - Page 29

• Manufacturer Part Number: KSZ9021GN TR
• Description: Specifications: Number of Drivers/Receivers: 8/8 ; Type: Transceiver ; Voltage - Supply: 3.135 V ~ 3.465 V ; Package / Case: 64-VFQFN Exposed Pad ; Packaging: Tape & Reel (TR) ; Protocol: Gigabit Ethernet ; Lead Free Status: Lead Free ; RoHS Stat
• Manufacturer: Micrel Inc

Micrel, Inc.
Register Map
The IEEE 802.3 Specification provides a 32 register address space for the PHY. Registers 0 thru 15 are standard PHY
registers, defined per the specification. Registers 16 thru 31 are vendor specific registers.
The KSZ9021GN uses the IEEE provided register space for IEEE Defined Registers and Vendor Specific Registers,
and uses the following registers to access Extended Registers:
Examples:
September 2010
Register Number (Hex)
IEEE Defined Registers
0 (0h)
1 (1h)
2 (2h)
3 (3h)
4 (4h)
5 (5h)
6 (6h)
7 (7h)
8 (8h)
9 (9h)
10 (Ah)
11 (Bh)
12 (Ch)
13 (Dh)
14 (Eh)
15 (Fh)
Vendor Specific Registers
16 (10h)
17 (11h)
18 (12h)
19 (13h)
20 (14h)
21 (15h)
22 (16h) – 26 (1Ah)
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Register 11 (Bh) for Extended Register – Control
Register 12 (Ch) for Extended Register – Data Write
Register 13 (Dh) for Extended Register – Data Read
Extended Register Read
Extended Register Write
1. Write register 11 (Bh) with 0103h
2. Read register 13 (Dh)
1. Write register 11 (Bh) with 8102h
2. Write register 12 (Ch) with 0010h
Description
Basic Control
Basic Status
PHY Identifier 1
PHY Identifier 2
Auto-Negotiation Advertisement
Auto-Negotiation Link Partner Ability
Auto-Negotiation Expansion
Auto-Negotiation Next Page
Auto-Negotiation Link Partner Next Page Ability
1000Base-T Control
1000Base-T Status
Extended Register – Control
Extended Register – Data Write
Extended Register – Data Read
Reserved
Extended – MII Status
Reserved
Remote Loopback, LED Mode
LinkMD
Digital PMA/PCS Status
Reserved
RXER Counter
Reserved
®
– Cable Diagnostic
// Read from Operation Mode Strap Status Register
// Set register 259 (103h) for read
// Read register value
// Write to Operation Mode Strap Override Register
// Set register 258 (102h) for write
// Write 0010h value to register to set NAND Tree mode
29
M9999-091010-1.1
KSZ9021GN