参数资料
| 型号： | BBT3821-JH |
| 厂商： | Intersil |
| 文件页数： | 8/75页 |
| 文件大小： | 0K |
| 描述： | IC RE-TIMER OCTAL 192-BGA |
| 标准包装： | 90 |
| 类型： | 时钟和数据恢复（CDR），多路复用器 |
| PLL： | 无 |
| 输入： | CML |
| 输出： | CML，CMOS |
| 电路数： | 1 |
| 比率 - 输入:输出： | 8:8 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 3.1875Gbps |
| 电源电压： | 1.425 V ~ 2.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 192-EBGA |
| 供应商设备封装： | 192-EBGA-B（17x17） |
| 包装： | 托盘 |
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16
I2C Space Interface
In addition to the standard MDIO registers discussed above,
the BBT3821 implements the register addresses specified in
the XENPAK MSA specification for the NVR, DOM and LASI
blocks. The built-in I2C controller can be configured to load
these registers with the MSA-specified data on start-up or
reset or on demand from an I2C EEPROM (frequently
included as part of a DOM circuit) and/or one or four DOM
circuits (see below). Optionally, a portion of the NVR space
may be used to autoload the various BBT3821 control
registers at start-up or reset. These operations are
discussed in more detail below.
NVR Registers & EEPROM
If the XP_ENA pin is asserted enabled (high), at the end of
hardware RESET or power-up the BBT3821 will attempt to
load the NVR area by initiating a NVR-block read through
the 1.32768 (1.8000’h) control register (Table 15). See
Figure 18. The same will occur if the appropriate command
value is written into this register. The I2C interface will
attempt to read the A0.00:FF’h I2C space into the
1.8007:8106’h MDIO register space. The Command Status
bits in the 1.32768 (1.8000’h) Control register will reflect the
status of this operation. Failure may occur if the expected
ACK is not received from any address after the number of
attempts set in control register 1.32273 (1.8005’h), default
timing sequence of this Block Read operation is shown in
Figure 20. The host can check the checksums against the
values at 1.807D, and optionally 1.80AD and 1.8106, and
take appropriate action. As soon as the XENPAK MDIO
space is loaded, the STA MDIO device may interrogate it.
Note that the BBT3821 merely stores the values read from
the EEPROM or other device at A0.00-FF’h, and, with a few
exceptions, does not interpret them in any way. The
exceptions are listed explicitly in Table 22, together with the
other uninterpreted groups, and are:
The Package OUI at 1.32818:32821 (1.8032:5’h), which
will be mirrored in the IEEE-defined 1.14:15 (1.E:F’h)
space, as required by section 10.8.2 of the XENPAK spec;
the allowable values here are specified by the XENPAK,
XPAK and X2 specifications;
The DOM Capability byte at 1.32890 (1.807A), see the
DOM Registers section, page 16;
The Auto-configure size and pointer bytes at
1.33028:9(1.8104:5); (see Auto-Configuring Control
Registers, page 16).
If the Auto-configure operation is enabled, the block of
bytes so specified will be written into the BBT3821 control
registers, (see Auto-Configuring Control Registers on
Other registers may be interpreted in future versions of the
BBT3821.
Auto-Configuring Control Registers
If the XP_ENA pin is asserted, and the I2C controller can
successfully read the I2C NVR space into the MDIO NVR
space, the BBT3821 will examine the Auto-configure Pointer
value at 1.33029 (1.8105’h). If this is neither 00’h or FF’h,
the BBT3821 will use that value (S below) as an offset
pointer into the A0.00:FF’h I2C space already copied into the
MDIO NVR space, and the number of bytes given in the
Auto-configure Size register 1.33028 (1.8104) value (N
below) to load N bytes from the NVR data starting from
location S into the various BBT3821 configuration control
registers. The loading sequence and the correspondence
between the NVR block and the control registers is listed in
Table 92. The auto-configure engine will behave benignly if
the S and N values are misconfigured, so that if S + N
≥ 252
(for example), the auto-configure block will stop at an S + N
value of 252, and not use S, N , or the Checksum value to
load a configuration control register. (Hence the exclusion of
FF’h as a value for S is no limitation). Similarly, values of N >
40 will be ignored.
Note that in a XENPAK/XPAK/X2 module, the value of S should
not be between 00’h and 76’h, since this would start the loading
from within the MSA-defined region. (Hence the exclusion of
00’h as a value for S is normally no limitation). If the value of S
lies between 77’h and A6’h, that portion of the auto-configure
data within that band can be overwritten as part of the
Customer Writable area defined by the MSA specifications; if
this is undesirable, that range of values should also be
excluded. On the other hand, this could be used to allow some
customization for specific end-user configuration values. If the
block overlaps the boundary between the ‘Customer Writable’
and ‘Vendor Specific’ areas, the first part would be customer-
writable, and the second part not. The order of the configuration
registers has been arranged to place those most likely to be
useful in such a customer-configuration environment at the
beginning of the block. The ‘Customer Area Checksum’ would
be part of the auto-configure block, and some other byte in the
‘Customer Writeable Area’ would need to be adjusted to make
the Checksum and the desired configuration value coincide.
The Command Status bits in the NVR Command register
(Table 15) at 1.32768.3:2 (1.8000’h.3:2) will reflect the success
of both the NVR and (if called for) the auto-configure loading
operations.
DOM Registers
If the NVR load operation succeeds, the (newly read-in)
XENPAK register at 1.32890 (1.807A’h) is examined, and if the
will attempt to read the DOM values from the I2C device
address space specified in the same register (bits 2:0),
details. A full block of data will be read from this space (normally
A2.00:FF’h) into the 1.40960:41215 (1.A000: A0FF’h) MDIO
The DOM control register is implemented in the BBT3821 at
BBT3821
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